x+3.2x=4.8 16+7x=45 5.2x-x=32.4

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x+3.2x=4.816+7x=455.2x-x=32.4x+3.2x=4.816+7x=455.2x-x=32.4x+3.2x=4.816+7x=455.2x-x=32.4x+3.2x=4.84.2

x+3.2x=4.8 16+7x=45 5.2x-x=32.4
x+3.2x=4.8 16+7x=45 5.2x-x=32.4

x+3.2x=4.8 16+7x=45 5.2x-x=32.4
x+3.2x=4.8
4.2x=4.8
x=8/7
16+7x=45
7x=45-16=29
x=29/7
5.2x-x=32.4
4.2x=32.4
x=54/7

1.合并同类项:解 4.2X=4.8 X=8/7
2.同上 7X=29 X=29/7
3.同上 4.2X=32.4 X=54/7