1+2+2+2344+246-242+3546
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ND
4
22 tháng 7 2016
A = 2582 - 2422/2542 - 2462
A = (258 - 242).(258 + 242)/(254 - 246).(254 + 246)
A = 16.500/8.500
A = 2
DK
0
8 tháng 6 2017
make sentences using the given words.
1.He/say/he/be/back/following/day.
he says that he will be back the following day.
2.question/be/too/difficult/young/students/answer.
the question is too difficult for the young students to answer.
3. Thu Ha/not/satisfied/her/preparations/Tet/though/decorate/house/plenty/cakes.
Thu Ha is not satisfied with her preparations for Tet even though she has decorated her houseand made plenty of cakes.
8 tháng 6 2017
make sentences using the given words.
1.He/say/he/be/back/following/day.
-> He said he would be back the following day.
2. question/be/too/difficult/young/students/answer.
-> The question is too difficult for the young students to answer.
3. Thu Ha/not/satisfied/her/preparations/Tet/though/decorate/house/plenty/cakes.
-> Thu Ha is not satisfied with her preparations for Tet though she decorated the house with plenty cakes.
KT
26 tháng 7 2018
\(M=\frac{258^2-242^2}{254^2-246^2}\)
\(=\frac{\left(258-242\right)\left(258+242\right)}{\left(254-246\right)\left(254+246\right)}\)
\(=\frac{16.500}{8.500}\)
\(=2\)
p/s: chúc bạn hk tốt
CM
27 tháng 12 2018
246 + 58 + 54 + 242 = (246 + 54) + (58 + 242) = 300 + 300 =600
30 tháng 1 2022
a: \(A=\dfrac{\left(258-242\right)\left(258+242\right)}{\left(254-246\right)\left(254+246\right)}=\dfrac{16}{8}=2\)
b: \(=\left(263+37\right)^2=300^2=90000\)
c: \(=\left(136-46\right)^2=90^2=8100\)
d: \(=50^2-49^2+48^2-47^2+...+2^2-1^2\)
=50+49+...+2+1
=51x50:2=1275
NA
11
2 tháng 2 2018
1 + 67 = 68
2 + 12 = 14
2133 + 2344 = 4477
888 + 999 = 1887
nếu đúng mk nha ủng hộ mk nhé kb mk đi ^^
28 tháng 1 2018
x + ( x + 1 ) + ( x + 2 ) + .... + ( x + 2344 ) + 2345 = 2345
( có 2346 số hạng )
x + ( x + 1 ) + ( x + 2 ) + ..... + ( x + 2344 ) = 2345 - 2345
x + ( x + 1 ) + ( x + 2 ) + ..... + ( x + 2344 ) = 0
( có 2345 số hạng )
[ ( x + 2344 ) + x ] . 2345 : 2 = 0
[ ( x + 2344 ) + x ] . 2345 = 0 . 2
( 2x + 2344 ) . 2345 = 0
2x + 2344 = 0 : 2345
2x + 2344 = 0
2x = 0 - 2344
2x = - 2344
x = - 2344 : 2 = - 1172
Vậy x = - 1172
=5899 nhé
1 + 2 + 2 + 2344 + 246 - 242 + 3546
= 5 + 2344 + 246 - 242 + 3546
= 2595 - 242 + 3546
= 5899