解方程:7x+2x=0.81;4(x-6)=36;2x+0.2xX2=36
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解方程:7x+2x=0.81;4(x-6)=36;2x+0.2xX2=36解方程:7x+2x=0.81;4(x-6)=36;2x+0.2xX2=36解方程:7x+2x=0.81;4(x-6)=36;2
解方程:7x+2x=0.81;4(x-6)=36;2x+0.2xX2=36
解方程:7x+2x=0.81;4(x-6)=36;2x+0.2xX2=36
解方程:7x+2x=0.81;4(x-6)=36;2x+0.2xX2=36
7x+2x=0.81
9X=0.81
X=0.09
4(x-6)=36;
x-6=9
x=3
2x+0.2xX2=36
2.4x=36
x=15
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