
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.


a)
\(-68+\left(-72\right)+2017+\left(-28\right)+168.\)
\(=\left(-68+168\right)+\left(-28-72\right)+2017.\)
\(=\left(168-68\right)+\text{ }\left[-\left(72+28\right)\right]+2017.\)
\(=100+\left(-100\right)+2017.\)
\(=100-100+2017.\)
\(=2017\)
b)
\(\left|-28\right|+\left(129-182+99\right)\)\(-\left(129+199-182\right)\)
\(=28+129-182+99\)\(-129-199+182.\)
\(=28+\left(129-129\right)+\left(182-182\right)\)\(-\left(199-99\right)\)
\(=28+0+0-100.\)
\(=-\left(100-28\right)\)
\(=-72\)
c)
\(17\left(-83\right)+18\times83.\)
\(=-17\left(83\right)+18\left(83\right)\)
\(=83\left[18+\left(-17\right)\right]\)
\(=83\left(18-17\right)\)
\(=83\left(1\right)\)
\(=83\)
d)
\(2018^0-\left(15^2\div\left[175+\left(2^3\times5^2-6\times25\right)\right]\right).\text{ }\)
\(=1-\left(15^2\div\left[175+\left(8\times25-6\times25\right)\right]\right)..\)
\(=1-\left(15^2\div\left[175+\left(25\left[8-6\right]\right)\right]\right)\)
\(=1-\frac{15^2}{175+\left(25\times2\right)}.\)
\(=1-\frac{15^2}{175+50}\)
\(=1-\frac{225}{225}\)
\(=1-1\)
\(=0\)
Học tốt

ta có: A = 68 x 68 = 68 x 65 + 68 x 3
B = 65 x 71 = 65 x 68 + 65 x 3
=> 68 x 3 > 65 x 3
=> 68 x 65 + 68 x 3 > 65 x 68 + 65 x 3
=> A >B

thực hiện phép tính bằng cách hợp lí (nếu có thể)
a,136:{[(468+332):160-5]+68}+2014
= 136 : { [ ( 468 + 332 ) : 160 - 5 ] + 68 } + 2014
= 136 : { [ 800 : 160 - 5 ] + 68 } + 2014
= 136 : { [ 5 - 5 ] + 68 } + 2014
= 136 : { 0 + 68 } + 2014
= 136 : 68 + 2014
= 2 + 2014
= 2016
\(136:\left\{\left[\left(468+332\right):160-5\right]+68\right\}+2014\)
\(=136:\left[\left(800:160-5\right)+68\right]+2014\)
\(=136:\left[\left(5-5\right)+68\right]+2014\)
\(=136:\left(0+68\right)+2014\)
\(=136:68+2014=2+2014\)
\(=2016\)

Sân si tí...
Ta có: \(29\cdot\left(232+68\right)+71\cdot\left(232+29\right)\)
\(=29\cdot232+29\cdot68+71\cdot232+29\cdot71\)
\(=\left(29\cdot232+71\cdot232\right)+\left(29\cdot68+29\cdot71\right)\)
\(=232\cdot100+29\cdot139\)
\(=23200+4031\)
\(=27231\)

\(160-\left(6\cdot5^3-2\cdot3^2\right)-2017^0\)
\(=160-\left(6\cdot125-2\cdot9\right)-1\)
\(=160-\left(750-18\right)-1\)
\(=160-732-1\)
\(=-572-1\)
\(=-573\)

a,xét A:
A=2016x2018
A=2016x(2017+1)
A=2016x1+2016x2017
Xét B:
B=2017x2017
B=2017x(2016+1)
B=2017x2016+2017x1
Vì cả 2 vế Avà B đều có 2017x2016maf 2017x1>2016x1 nên A bé hơn B

125.(-48)+25.48
=-125.48+25.48
=48.(-125+25)
=48.100
=4800
-2017-(68-2017)
=-2017-68+2017
=-2017+(-68)+2017
=(-2017+2017)+-68
=0+-68
=-68
(-6-2).(-6+2)
=[-6+(-2)].(-4)
=(-8).(-4)
=32
k nah bn...^_^...thanks♥