1.
原式=(2/3)^(-2)/(-1/2)
=(3/2)^2×(-2)
=9/4×(-2)
=-9/2
2.
原式=(x-2-x-4x+4+2/x^2-1/x^2)/(x/x-4)
=(2-4x+1/x^2)/x×(x-4)
=(2-4x+1/x^2)×(1/x)×(x-4)
=(2x^2-4x^3+1/x^2)×(1/x)×(x-4)
=(2x^2-4x^3+1/x^3)×(x-4)
=2x^3-12x^2+17x-4/x^3
1.
原式=(2/3)^(-2)/(-1/2)
=(3/2)^2×(-2)
=9/4×(-2)
=-9/2
2.
原式=(x-2-x-4x+4+2/x^2-1/x^2)/(x/x-4)
=(2-4x+1/x^2)/x×(x-4)
=(2-4x+1/x^2)×(1/x)×(x-4)
=(2x^2-4x^3+1/x^2)×(1/x)×(x-4)
=(2x^2-4x^3+1/x^3)×(x-4)
=2x^3-12x^2+17x-4/x^3