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=42
2.8x=42
x=42÷2.8
x=15

2.8x=42
X=15

3.8x-x=42
2.8x=42
x=42/2.8
x=15

3.8x-x=42
(3.8-1)x=42
2.8x=42
x=42÷2.8
x=15

3.8X-X=42
解:2.8X=42
X=42÷2.8
X=15
说明:2.8X是因为3.8X-X而得来的,两个X的数值都是一样的.42÷2.8是因为除法的性质!!
懂了吧!

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