Question

1右12分之1-[(-5)的2次方乘以(5分之1)的3次方-0.8]除以2右5分之2乘以(-1+6分之1)

快

Answer 1

(1+1/12) - [ (-5)² × (1/5)³- 0.8 ] ÷ (2+2/5)× (-1+1/6)
= 13/12 - [ 5² ×1/5³- 4/5 ] ÷ 12/5 × (-5/6)
= 13/12 - [ 1/5 - 4/5 ] ÷ 12/5 ×(-5/6)
= 13/12 + 3/5 ×5/12 × (-5/6)
=13/12-5/24
=21/24
=7/8

Answer 2

(1+1/12) - [ (-5)^2 * (1/5)^3 - 0.8 ] ÷ (2+2/5) * (-1+1/6)
= 13/12 - [ 5^2 * 1/5^3 - 4/5 ] ÷ 12/5 * (-5/6)
= 13/12 - [ 1/5 - 4/5 ] ÷ 12/5 * (-5/6)
= 13/12 - (-3/5) *5/12 * (-5/6)
= 13/12 - 5/24
= 21/24
= 7/8