Question

Bài 1: Tính hợp lý

a) (-7) - 25 + 27 - (-5)

b) (-2)³ + (-2)⁴ - (-2)²

c) (-8)⁰ + (-1 phần 7)⁰ - (-2)³

d) 65 × ( 23 + 35 ) - 35 × ( 65 - 23 )

f) 8 + [1800 - ( 4³ - 18 × 3 )³ ] × 8 - |-5|

h) - ( 123 + 46 ) - ( -46 - 123 )

Answer 1

a)\(-7-25+27+5=\left(27-7\right)+\left(5-25\right)\)

\(=20-20=0\)

b)\(-8+16-\left(-8\right)=-8+16+8=\left(8-8\right)+16=16\)

c)\(1+1-\left(-8\right)=1+1+8=10\)(Vì số nào mũ 0 cũng bằng 1(ngoại trừ số 0))

d)\(65.23+65.35-35.65+35.23\)

\(=\left(65.35-65.35\right)+23.\left(65+35\right)\)

\(=0+23.100=2300\)

f) \(8+\left[1800-\left(64-54\right)^3\right].8-5\)

\(=8+\left(1800-10^3\right).8-5\)

\(=8+800.8-5=6403\)

h)\(-123-46+46+123=\left(123-123\right)+\left(46-46\right)\)

\(=0+0=0\) (phá ngoặc ra thôi nhé)