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Xét tổng \(13+15+.......+91+93\)
Số số hạng của tổng trên là: \(\left(93-13\right):2+1=41\)
Vì tổng trên là tổng của 41 số lẻ, mà 41 là số lẻ
nên tổng \(13+15+.....+91+93\)phải là số lẻ
mà \(2+4+6+8+.......+100\)là số chẵn
nên \(\left(2+4+6+8+........+100\right)-\left(13+15+.........+91+93\right)\)phải là số lẻ
mà 40 là số chẵn nên Hồng tính sai
a)=\(\frac{-2.4}{5.7}+\frac{-3.2}{5.7}+\frac{-3}{5}\)
=\(\frac{-2.4}{5.7}+\frac{-2.3}{5.7}+\frac{-3}{5}\)
=\(\frac{-2}{5}\left(\frac{4+3}{7}\right)+\frac{-3}{5}\)
=\(\frac{-2}{5}.1+\frac{-3}{5}\)
=-1
b)
b1:
1,(-24)+6+10+24=-24+6+10+24=6+10=16
2,15+23+(-25)+(-23)=15+23-25-23=15-25=-10
3,-3+(-350)+(-7)+350=-3-350-7+350=-3-7=-10
4,=0
5,=-41
6,=60
7,=-30
8,=0
b2
(35+75)+(345-35-75)=35+75+345-35-75=345
(2002-79+15)-(-79+15)+2002-79+15+79-15+2002
-(515-80+91)-(2003+80-91)=-515+80-91-2003-80+91=-515-2003=-2518
bài 1 nhác ghi thông cảm nha
1,(-24)+6+10+24
= (-24+24)+6+10
=0+6+10
=16
2,15+23+(-25)+(-23)
=(15-25)+(23-23)
=-10+0
=-10
3,-3+(-350)+(-7)+350
=-(3+7)+(-350+350)
=-10+0
=-10
4,-9+(-11)+21+(-1)
=-(9+1)+(-11+21)
=-10+10
=0
5,(-37)+26+15+37
=(-37+37)+(26+15)
=0+31
=31
6,45+75+(-15)+(-45)
=(45-45)+(75-15)
=0+60
=60
7,(-12)+532+(-18)+(-532)
=-(12+18)+(532-532)
=-30+0
=-30
8,-7+(-20)+57+(-30)
=(-7+57)-(20+30)
=50-50
=0
tính:
a.(-2/3+3/7) : 4/5 + (-1/3+4/7) : 4/5
b. 5/9 : (1/11-5/22) + 5/9 : (1/15 - 2/3)
Help Me, Please !
a.(-2/3+3/7) : 4/5 + (-1/3+4/7) : 4/5
= [(-2/3 + 3/7) + (-1/3 + 4/7)] : 4/5
= [(-2/3 + (-1/3) + (3/7 + 4/7)] : 4/5
= [-1 + 1] : 4/5
= 0 : 4/5
= 0
a) \(\left(\frac{-2}{3}+\frac{3}{7}\right).\frac{5}{4}+\left(\frac{-1}{3}+\frac{4}{7}\right).\frac{5}{4}\)
=\(\left(\frac{-2}{3}+\frac{-1}{3}+\frac{3}{7}+\frac{4}{7}\right).\frac{5}{4}\)
= \(0.\frac{5}{4}=0\)
b) \(\frac{5}{9}:\left(\frac{1}{11}-\frac{5}{22}+\frac{1}{15}-\frac{2}{3}\right)\)
=\(\frac{5}{9}:\frac{-81}{110}=\frac{-550}{729}\)
\(\frac{2}{7}+\frac{7}{12}=\frac{24}{84}+\frac{49}{84}=\frac{73}{84}\)
\(\frac{25}{48}+\frac{22}{48}=\frac{47}{48}\)
\(\frac{5}{7}+\frac{3}{8}=\frac{40}{56}+\frac{21}{56}=\frac{61}{56}\)
\(\frac{15}{24}+\frac{15}{16}=15.\left(\frac{1}{24}+\frac{1}{16}\right)=\frac{25}{16}\)
\(\frac{5}{6}+\frac{3}{4}=\frac{20+18}{24}=\frac{19}{12}\)
\(\frac{9}{24}+\frac{14}{24}=\frac{23}{24}\)
học tót tích mình hem
| Tính từ | so sánh hơn | so sánh nhất |
| 1.modern | more modern | the most modern |
| 2.beautiful | more beautiful | the most beautiful |
| 3.early | earlier | the earliest |
| 4.safe | safer | the safest |
| 5.bad | worse | the worst |
| 6.little | less | the least |
| 7.few | less | the least |
| 8.wonderful | more wonderful | the most wonderful |
| 9.pretty | prettier | the prettiest |
| 10.easy | easier | the easiest |
| 11.far | further | the furthest |
| 12.narrow | narrower | thenarrowest |
| 13.different | more different | the most different |
| 14.smart | smarter | the smartest |
| 15.hot | hotter | the hottest |
| 16.cool | cooler | the coolest |
| 17.good | better | best |
| 18.large | larger | largest |
| 19.serious | more serious |
the most serious
điền các từ turn left , come in , don't forget , stop the car! , help me! , have, don't listen , pass , don't be late ! , open, come, cath, take vào chỗ trống
1.......take........... an umbrella with you . It's raining
2........have......... a rest . You look tired
3........turn left.......... at the end of the street
4.......help me!........... I can't swim!
5.......don't forget.......... to take your passport
6.......stop the car!........... there's a mouse in the road
7.......come............ to my cocktail party , please
8........open............ your books at page 15
9.................... the salt, please
10.......don't listen.......... to that record. It's terrible
11.......don't be late!........... the train leaves at 8 o'clock
12.................. and have a glass of lemonde
13.......catch........... the first train in the morning
P/S:lm đc chừng này thôi thấy đề sai
6 . " Hurry up " He told me
=> He told me to hurry up
7 . " Do this test again , please " the teacher told
=> The teacher told me to do that test again
8. " Don't make noise in class " the teacher told
=> The teacher told us not to make noise in class
9. "Leave your keys on the desk , please "
=> The police asked me to leave your keys on the desk
10 ." Don't use the telephone after 7 o' clock "
=> She told me not to use the telephone after 7 o' clock
11. " Finish the job tonight , please ''
=> The boss asked Miss White to finish the job tonight
12." Would you open the door , please "
=> He told me to open the door
13 . " Could you lend me some money , please ? "
=> He told me to lend him some money
14. " Would you pass me a cigarrete ? "
=>He told me to pass him a cigarrete
15 . " Will you clean the floor for me "
=> She told me to clean the floor for her
16 . " Can you help me to do this test "
=> My friend told me to help her to do that test
6 . " Hurry up " He told me
he told me to hurry up
7 . " Do this test again , please " the teacher told
the teacher told me not to do this test again
8. " Don't make noise in class " the teacher told
the teacher told me not to make noise in class
9. "Leave your keys on the desk , please "
they told me to leave my keys on the desk
10 ." Don't use the telephone after 7 o' clock "
they told me not to use the telephone after 7 o'clock
11. " Finish the job tonight , please '
they told me to finish the job tonight
12." Would you open the door , please "
they told me to open the door
13 . " Could you lend me some money , please ? "
they had told me to lend them some money
14. " Would you pass me a cigarette? "
he told me to pass him a cigarette
15 . " Will you clean the floor for me "
he told me to clean the floor for him
16 . " Can you help me to do this test "
he told me to help him to do this test
V .
1 . " Who often cleans the house ? " He asked Ba
he asked ba who often cleaned the house
2. " Do you stay at home at weekends ? " She asked me
she asked me if I stayed at home at weekends
3 . " I'm very tired now " said Hoa
hoa said she was very tired then
4. " Where does she go every evening ? " Lan asked her brother
lan asked her brother where she went every evening
5. " Will you come to my house for dinner " He asked me
he asked me if I would come to his house for dinner
6. " Why don't we go jogging " Ba said to us
ba said us not to go jogging
7. " The test isn't easy enough for us to do " We said
we said that the test isn't easy enough for us to do
8. " How was you yesterday ? he asked her
he asked her how she was yesterday
TL:
6 : 5 = 1,2
12 : 8 = 1,5
39 : 15 = 2,6
15 : 4 = 3,75
HT
~~~~~~~~~~~~~~~~
Học tốt!:)
a) 1,2
b)1,5
c)2,6
d)3,75
~HT~