1.x-0.7x=2.342.x-0.8x=123.4(3x-x)=64
3个回答
1.
x-0.7x=2.34
0.3x=2.34
x=7.8
2.
x-0.8x=12
0.2x=12
x=60
3.
4(3x-x)=64
2x=64
x=32
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