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

-22.83 + ( -83).(-72)

= -1826 + 5976

= 4150

72,9 x 99 +72 + 0,9

= 72,9 x 99 + 72,9

=72,9 x 99 + 72,9 x1

= 72,9 x ( 99 + 1)

=72,9 x 100

= 7290

77,9x99+72+0,9

=77,9x99+(72+0,9)

=77,9x99+77,9x1

=77,9x(99+1)

=77,9x100

=7790

Câu trả lời nào đúng vậy ?

29+29+......+29+83+...+83

=29.17+83.29

=29(17+83)

=29.100

=2900

tick bạn

`@` `\text {Ans}`

`\downarrow`

`2023 \times 14 + 2023 \times 83+97`

`= 2023 \times (14+83) + 97`

`= 2023 \times 97 + 97`

`= 196231 +97`

`= 196328`

`78 \times 31+78 \times 24+78 \times 17+78 \times 22 \times 72`

`= 78 \times (31+24+17+22 \times 72)`

`= 78 \times (31+24+17+1584)`

`= 78 \times 1656`

`= 129168`

`371 \times 69+371 \times 14+629 \times 83`

`= 371 \times (69+14) + 629 \times 83`

`= 371 \times 83 + 629 \times 83`

`= 83 \times (371+629)`

`= 83 \times 1000`

`= 83000`

`91 \times 51+49 \times 163-49 \times 72`

`= 91 \times 51 + 49 \times (163-72)`

`= 91 \times 51+49 \times 91`

`= 91 \times (51+49)`

`= 91 \times 100`

`= 9100`

`3 \times 12 \times 17 + 4 \times 9 \times 81 + 2 \times 6 \times 6`

`= 9 \times 4 \times 17 + 4 \times 9 \times 81 + 4 \times 9 \times 2`

`= 9 \times 4 \times (17+81+2)`

`= 36 \times 100` 

`= 3600`

`42 \times 17 + 58 \times 83 \times 42 \times 83 + 42 \times 83 + 17`

`= 17 \times (42+58) + 42 \times 83 \times (58 \times 83 +1)`

`= 17 \times 100 + 3486 \times 4815`

`= 1700 + 16785090`

`= 16786790`