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17/13= 17/13 , 14/23= 14/23 , 75/100=3/4 , 9/13=9/13 , 9/23=9/23 , 15/60=5/12
7/4 x 15/7 + 13/7 x 9/4 - 7/4 x2/7
=7/4 x 15/7- 7/4 x2/7+ 13/7 x 9/4
=7/4 x (15/7 - 2/7) + 13/7 x 9/4
=7/4 x 13 /7 + 13/7 x 9/4
=13/7 x (7/4+9/4)
=13/7 x 16/4
=13/7 x 4
=52/7
k mk nha
sorry câu trả lời vừa nãy mk ấn nhầm
7/4 x 15/7 + 13/7 x 9/4 - 7/4 x2/7
=7/4 x 15/7 - 7/4 x 2/7 + 13/7 x 9/4
1035 + 207 x 4 x 28 - 69 x 3 x 17
1035 + 207 x 112 - 207 x 17
1035 + 207 x(112-17)
207 x 5 + 207 x 95
207 x (5+95)
5+6+7+8+9+10+11+12+13+14+15
=(15+5)+(14+6)+(13+7)+(12+8)+(11+9)+10
=20+20+20+20+20+10
=5.20+10
=100+10
=110
9+3+2+1+7+8+5+10+6+4= (9+1)+(2+8)+(3+7)+(4+6)+5=10+10+10+10+5=10.4+5=40+5=45
Bài 1:
a) 19/27+9/7+6/27+5/7+2/7
= (19/27+6/27) + (9/7+5/7+2/7)
=1 + 16/7
=23/7
b) 2/7 + 27/48 + 7/16 +45/63
= (2/7 + 45/63) + (27/48 +7/16)
= (2/7 + 5/7) + ( 9/16 + 7/16)
= 1 + 1
=2
c) Tính bằng cách bình thường
Bài 2:
6/11 + x = 1
x = 1-6/11
x = 5/11
Bài làm
a) \(\frac{19}{27}+\frac{9}{7}+\frac{6}{27}+\frac{5}{7}+\frac{2}{7}\)
\(=\frac{27}{27}+\frac{16}{7}\)
\(=1+\frac{16}{7}\)
\(=\frac{7}{7}+\frac{16}{7}\)
\(=\frac{23}{7}\)
b) \(\frac{2}{7}+\frac{27}{48}+\frac{7}{16}+\frac{45}{63}\)
\(=\left(\frac{18}{63}+\frac{45}{63}\right)+\left(\frac{27}{48}+\frac{21}{48}\right)\)
\(=\frac{63}{63}+\frac{48}{48}\)
\(=1+1\)
\(=2\)
c) \(\frac{17}{23}+\left(\frac{4}{7}-\frac{6}{13}\right)\)
\(=\frac{17}{23}+\left(\frac{52}{91}-\frac{42}{91}\right)\)
\(=\frac{17}{23}+\frac{10}{91}\)
\(=\frac{1547}{2093}+\frac{230}{2093}\)
\(=\frac{1770}{2093}\)
Bài 2
\(\frac{6}{11}+x=1\)
\(x=1-\frac{6}{11}\)
\(x=\frac{11}{11}-\frac{6}{11}=\frac{5}{11}\)
Vậy \(x=\frac{5}{11}\)
\(a.\) \(\frac{4}{15}.\frac{7}{9}+\frac{4}{15}.\frac{2}{9}\)
\(=\frac{4}{15}\left(\frac{7}{9}+\frac{2}{9}\right)\)
\(=\frac{4}{15}.\frac{9}{9}\)
\(=\frac{4}{15}.1\)
\(=\frac{4}{15}\)
\(b.\) \(\frac{13}{19}.\frac{23}{11}-\frac{13}{19}.\frac{8}{11}-\frac{13}{19}.\frac{4}{11}\)
\(=\frac{13}{19}\left(\frac{23}{11}-\frac{8}{11}-\frac{4}{11}\right)\)
\(=\frac{13}{19}.\frac{11}{11}\)
\(=\frac{13}{19}.1\)
\(=\frac{13}{19}\)
a)4/15 x(7/9+2/9)=4/15x1=4/15
b)13/19x(23/11-8/11-4/11)13/19x1=13/19
TA có 13-13*1+10-10= 13- 13+10-10=0+0=0
(10*11+12*13+14*15+...+22*23+24*25)*0=0
* là dấu x nhe bạn
thick minh nha
( 10 x 11 + 12 x 13 + 14 x 15 + ... + 22 x 23 + 24 x 25) x ( 13 - 13 x 1 + 10 -10)
= ( 10 x 11 + 12 x 13 + 14 x 15 + ... + 22 x 23 + 24 x 25) x 0
= 0
k cho anh nha !!!!!!!!!!!!!!!! : học lớp 5 rùi
\(\frac{17}{13}-\frac{14}{23}+\frac{75}{100}+\frac{9}{13}-\frac{9}{23}+\frac{15}{60}\)
\(=\left(\frac{17}{13}+\frac{9}{13}\right)-\left(\frac{14}{23}+\frac{9}{23}\right)+\left(\frac{75}{100}+\frac{15}{60}\right)\)
\(=\frac{26}{13}-\frac{23}{23}+\left(\frac{3}{4}+\frac{1}{4}\right)\)
\(=2-1+\frac{4}{4}\)
\(=2-1+1\)
\(=2\)
Chúc bạn học tốt
2000000000000-346225784bang bao nhieu