解方程:(80-2X)(50-2X)=5400
问题描述:
解方程:(80-2X)(50-2X)=5400
答
(80-2X)(50-2X)=5400 4000-100x-160x+4x^ 2=5400 4x^ 2-260x=1400 x^ 2-65x=350 x(x-65)=350 x=70
解方程:(80-2X)(50-2X)=5400
(80-2X)(50-2X)=5400 4000-100x-160x+4x^ 2=5400 4x^ 2-260x=1400 x^ 2-65x=350 x(x-65)=350 x=70