求5道加、减、乘、除的和乘方,有理数混合运算.\\
问题描述:
求5道加、减、乘、除的和乘方,有理数混合运算.\\
答
(-2)^3×0.5-(-1.6)^2÷(-2)^2
原式=(-8)×(1/2)-(-8/5)^2÷4
=(-4)-(64/25)÷4
=(-4)-16/25
=-116/25
(-3/2)×[(-2/3)^2-2]
原式=(-3/2)×(4/9-2)
=(-3/2)×(-14/9)
=7/3
[(-3)^2-(-5)^2]÷(-2)
原式=(9-25)÷(-2)
=(-16)÷(-2)
=8
16÷(-2)^3-(-1/8)×(-4)
原式=16÷(-8)-1/2
=-2-1/2
=-5/2
(-3/4)×(-8+2/3-1/3)
原式=(-3/4)×(-8+1/3)
=(-3/4)×(-23/3)
=23/4