(1)(负10分之1)^-2
=(-10)^2
=100
(2)【(2x^-2)y】·(xy^-2)^-3
=2x^(-2)*y*(x-3y^6)
=2x^(-2-3)*y^(1+6)
=2x^(-5)y^7
(3)【(2m^3n)^-3】分之(3mn^2)^-2
=1/9m^(-2)n^(-4)÷1/8m^(-9)n^(-3)
=8/9m^(9-2)n^(3-4)
=8/9m^7n^(-1)
(1)(2x-3分之2x)-(2x+3分之1)=1
4x/3-2x-1/3=1
-2x/3=1+1/3
-2x/3=4/3
x=4/3÷(-3/2)
x=-2
(2)(x^2+x)分之2+(x^2-x)分之3=(x^2-1)分之4
两边同时乘以x(x+1)(x-1)
2(x-1)+3(x+1)=4x
2x-2+3x+3=4x
2x+3x-4x=-3+2
x=-1