1.8*(x+0.2)=72方程解答,(9-4.5)x=4.

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1.8*(x+0.2)=72方程解答,(9-4.5)x=4.

1.8*(x+0.2)=72方程解答,(9-4.5)x=4.
1.8*(x+0.2)=72方程解答,(9-4.5)x=4.

1.8*(x+0.2)=72方程解答,(9-4.5)x=4.
1.8*(x+0.2)=72 两边同除以1.8
x+0.2=40 把0.2移到右边
x=39.8
(9-4.5)x=4.5 先把左边括号内容算出来
4.5x=4.5 两边同除以4.5
x=1