0.8x+0.2(7-x)=3.8 怎么解

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0.8x+0.2(7-x)=3.8怎么解0.8x+0.2(7-x)=3.8怎么解0.8x+0.2(7-x)=3.8怎么解0.8x+0.2X7-0.2Xx=3.80.8x-0.2x=3.8-1.40.6

0.8x+0.2(7-x)=3.8 怎么解
0.8x+0.2(7-x)=3.8 怎么解

0.8x+0.2(7-x)=3.8 怎么解
0.8x+0.2X7-0.2Xx=3.8
0.8x-0.2x=3.8-1.4
0.6x=2.4
x=4