3/4X-(600-X)=1/5(600-X) 怎样解

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3/4X-(600-X)=1/5(600-X) 怎样解
3/4X-(600-X)=1/5(600-X) 怎样解

3/4X-(600-X)=1/5(600-X) 怎样解
3/4x-600+x=1/5×600-1/5x
3/4x+x+1/5x=120+600
39/20x=720
x=720÷39/20
x=369又13分之3

3/4X-(600-X)=1/5(600-X)
3/4X-600+X=150-1/5X
39/20x=-450
x=-3000/13

先通分：左右两边同乘以20，方程变为15X-20(600-X)=4(600-x)
移向15X-24(600-X)=0
15X+24X=24*600
39X=24*600
X=(24*600)/39=4800/13

0.75x-600+x=120-0.2x
1.75x-600=120-0.2x
1.95x=720

(3/4+1+1/5)x=(1+1/5)*600
x=4800/13

3/4x-600+x=1/5*600-1/5x
7/4x-600=120-1/5x
7/4x+1/5x=720
39/20x=720
x=720*20/39
x=4800/13

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