(-68) + (-72) + 2017 +(-28) +168
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (-68) + (-72) + 2017 + (-28) + 168
= (-68 + 168) + [(-72) + (-28)] + 2017
= 100 + (-100) + 2017
= 0 + 2017
= 2017
![](https://rs.olm.vn/images/avt/0.png?1311)
(-68) + (-72) + 2017 + (-28) + 168
= (-68 + 168) + [(-72) + (-28)] + 2017
= 100 + (-100) + 2017
= 0 + 2017
= 2017
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(219-28\right)+\left(168-72-219\right)=219-28+168-72-219=\left(219-219\right)+\left(168-28\right)-72=0+140-72=68\)
Chúc bạn học tốt@@
\(\left(219-28\right)+\left(168-72-219\right)=219-28+168-72-219=\left(219-219\right)+\left(168-28\right)-72=0+140-72=68\)
Chúc bạn học tốt@@
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
-129 - 72 - { -29 } + {-28 } + 2017
= -129 - 72 + 29 - 28 + 2017
= {-129 - 72 } + { 29 - 28 } + 2017
= {-129 + 29 } - { 72 + 28 } + 2017
= { 129 - 29 } - 100 +2017
= 100 -100 + 2017
= 0 + 2017
= 2017
![](https://rs.olm.vn/images/avt/0.png?1311)
(-68) + (-72) + 2017 +(-28) +168= -(68+72+28)+2017+168=(-168)+2017+168=2017