化简(80-x)*(60-x)

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化简(80-x)*(60-x)化简(80-x)*(60-x)化简(80-x)*(60-x)原式=4800-80x-60x+x²=x²-140x+4800(80-x)*(60-x)=

化简(80-x)*(60-x)
化简(80-x)*(60-x)

化简(80-x)*(60-x)
原式
=4800-80x-60x+x²
=x²-140x+4800

(80-x)*(60-x)
=4800-80x-60x+x²
=4800-140x+x²