(x+3)(x-4)-x(x-2),化简求值,其中x=12.5
问题描述:
(x+3)(x-4)-x(x-2),化简求值,其中x=12.5
答
(x+3)(x-4)-x(x-2)=x²-x-12-x²+2x=x-12=12.5-12=0.5
(x+3)(x-4)-x(x-2),化简求值,其中x=12.5
(x+3)(x-4)-x(x-2)=x²-x-12-x²+2x=x-12=12.5-12=0.5