请帮忙解几道方程式1,45-X=6+X-12,7.5=3(X-3.5)3,X+1250=2.5(X-1000)
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请帮忙解几道方程式
1,45-X=6+X-1
2,7.5=3(X-3.5)
3,X+1250=2.5(X-1000)
1,45-X=6+X-1
2,7.5=3(X-3.5)
3,X+1250=2.5(X-1000)
![请帮忙解几道方程式1,45-X=6+X-12,7.5=3(X-3.5)3,X+1250=2.5(X-1000)](/uploads/image/z/5109460-52-0.jpg?t=%E8%AF%B7%E5%B8%AE%E5%BF%99%E8%A7%A3%E5%87%A0%E9%81%93%E6%96%B9%E7%A8%8B%E5%BC%8F1%2C45-X%3D6%2BX-12%2C7.5%3D3%EF%BC%88X-3.5%293%2CX%2B1250%3D2.5%EF%BC%88X-1000%EF%BC%89)
1,45-X=6+X-1
X+X=45-6+1
2X=40
X=40÷2
X=20
2,7.5=3(X-3.5)
7.5÷3=X-3.5
X-3.5=2.5
X=2.5+3.5
X=6
3,X+1250=2.5(X-1000)
X+1250=2.5X-2.5×1000
X+1250=2.5X-2500
2.5X-X=1250+2500
1.5X=3750
X=3750÷1.5
X=2500
X+X=45-6+1
2X=40
X=40÷2
X=20
2,7.5=3(X-3.5)
7.5÷3=X-3.5
X-3.5=2.5
X=2.5+3.5
X=6
3,X+1250=2.5(X-1000)
X+1250=2.5X-2.5×1000
X+1250=2.5X-2500
2.5X-X=1250+2500
1.5X=3750
X=3750÷1.5
X=2500
请帮忙解几道方程式1,45-X=6+X-12,7.5=3(X-3.5)3,X+1250=2.5(X-1000)
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