作业帮(x+3)(x-4)-x(x-2),化简求值,其中x=12.5
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(x+3)(x-4)-x(x-2),化简求值,其中x=12.5
(x+3)(x-4)-x(x-2),化简求值,其中x=12.5
(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
原式=x2-x-1-x2+2x=x-1=11.5
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