Question

[Huỳnh Ái My]

Đề 2

1) Tính nhanh(nếu có thể) 

a) -14+12+(-12)(2³-7)

b) (-5)+2(-15)-(-3)+|-10|

c) 68.(12+32)-32.(68-12)

d) 89-(-43)-32

e) -12.(-6)²+(-4)³.12

Answer 1

[Phạm Quang Long]

1 Tính nhanh

a) \(-14+12+\left(-12\right)\left(2^3-7\right)\)

\(=-14+\left[12+\left(-12\right)\right].1\)

\(=-14+0.1\)

\(=-14+0=-14\)

b) \(\left(-5\right)+2\left(-15\right)-\left(-3\right)+\left|-10\right|\)

\(=\left(-5\right)+\left(-30\right)-\left(-3\right)+10\)

\(=\left(-35\right)-\left(-3\right)+10\)

\(=\left(-32\right)+10\)

\(=-22\)

c) \(68.\left(12+32\right)-32.\left(68-12\right)\)

\(=68.44-32.56\)

\(=2992-1792\)

\(=1200\)

d) \(89-\left(-43\right)-32\)

\(=132-32\)

\(=100\)

e) \(-12.\left(-6\right)^2+\left(-4\right)^3.12\)

\(=-12.36+64.12\)

\(=\left(-12+12\right).\left(36+64\right)\)

\(=0+100\)

\(=100\)