两边上下交叉相乘:
X8xX=(100-X)x(100-X)x18
8X^2=18(100-X)^2
4X^2=9(100-X)^2
两边开方:
2X=3(100-X)和 2X=-3(100-X)
X=60,X=300.
X8/(100-X)=(100-X)18/X怎么算!求详细解题过程、不要算一半、我不会呀!每个步骤都写出来、谢谢!最好这
两边上下交叉相乘:
X8xX=(100-X)x(100-X)x18
8X^2=18(100-X)^2
4X^2=9(100-X)^2
两边开方:
2X=3(100-X)和 2X=-3(100-X)
X=60,X=300.