Question

Bài 1: Bỏ dấu ngoặc rồi tính

 a) –(76 – 35 + 15) + [18 – 27 + (-17)]

b) 167 + [127 – 235 – (-16)] + (-67)

c) (-19) + 165 – [27 + (-21) – (+72)]

d) 89.(-2) + [20 + (-2).(-5) – 85]

mn giúp mình vs 
đANG cần gấp ạ

Answer 1

a) \(-\left(76-35+15\right)+\left[18-27+\left(-17\right)\right]\)

\(=-76+35+15+18-27-17\)

\(=-52\)

b) \(167+\left[127-235-\left(-16\right)\right]+\left(-67\right)\)

\(=167+127-235+16-67\)

\(=8\)

Answer 2

c) \(\left(-19\right)+165-\left[27+\left(-21\right)-\left(+72\right)\right]\)

\(=\left(-19\right)+165-27+21+72\)

\(=212\)

d) \(89.\left(-2\right)+\left[20+\left(-2\right).\left(-5\right)-85\right]\)

\(=\left(-178\right)+\left(20+10-85\right)\)

\(=\left(-178\right)+20+10-85\)

\(=-233\)