3.8x-x=42怎么解?
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3.8x-x=42怎么解?3.8x-x=42怎么解?3.8x-x=42怎么解?3.8x-x=42(3.8-1)x=422.8x=42x=42÷2.8x=15
3.8x-x=42怎么解?
3.8x-x=42怎么解?
3.8x-x=42怎么解?
3.8x-x=42
(3.8-1)x=42
2.8x=42
x=42÷2.8
x=15
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