Question

[Dìm BTS]

Bài 1 : Tính hợp lý nếu được

a) 14-(5-8)³+(-3)×5

b) -7×15+7×(-35)+(-1)²⁰¹⁹

c) -18×32+(-18)×45+77×(-32)-77×50

d) 104-4×[-5×8+(7-10)³]

e) (-19+49)-[-19+149+(-52)]

f) 29×(19-13)-19×(29-13)

g) (2020²⁰¹⁹-2019²⁰¹⁸)×[(-2)⁴×3+(-2)³×6]

Answer 1

[Nguyễn Lê Phước Thịnh]

a) Ta có: \(14-\left(5-8\right)^3+\left(-3\right)\cdot5\)

\(=14+27-15=26\)

b) Ta có: \(-7\cdot15+7\cdot\left(-35\right)+\left(-1\right)^{2019}\)

\(=-7\left(15+35\right)-1=-350-1=-351\)

c) Ta có: \(-18\cdot32+\left(-18\right)\cdot45+77\cdot\left(-32\right)-77\cdot50\)

\(=-18\left(32+45\right)+77\left(-32-50\right)\)

\(=-18\cdot77+77\cdot\left(-82\right)=77\left(-18-82\right)=77\cdot\left(-100\right)=-7700\)

d) Ta có: \(104-4\cdot\left[-5\cdot8+\left(7-10\right)^3\right]\)

\(=104-4\left[-40-27\right]=104-4\cdot\left(-67\right)=104+268=372\)

Answer 2

[Dìm BTS]

Thanks