(1 ).480 600 2.x 2x ------ — ------ =45 ---------- = ------------- +1y 2y x+1 3(x+1) 3 .x 5 ---------- — ---------- =22x-3 3-2x

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(1 ).480 600 2.x 2x ------ — ------ =45 ---------- = ------------- +1y 2y x+1 3(x+1) 3 .x 5 ---------- — ---------- =22x-3 3-2x
(1 ).480 600 2.x 2x
------ — ------ =45 ---------- = ------------- +1
y 2y x+1 3(x+1)
3 .x 5
---------- — ---------- =2
2x-3 3-2x

(1 ).480 600 2.x 2x ------ — ------ =45 ---------- = ------------- +1y 2y x+1 3(x+1) 3 .x 5 ---------- — ---------- =22x-3 3-2x
1.480/y-600/(2y)=45
(960-600)/2y=45
360=90y
y=4
2.x/(x+1)=2x/[3(x+1)]+1
3x/[3(x+1)]-2x/[3(x+1)=1
x=3(x+1)
2x=-3
x=-1.5
3.x/(2x-3)-5/(3-2x)=2
x/(2x-3)+5/(2x-3)=2
x+5=4x-6
3x=11
x=11/3 .

1,y=(480-300)/45=4
2,1/3x=x+1,所以x=-3/2
3,x=11/3

1: 4
2:-3/2
3:11/3

1、y=4
2、x=-1.5
3、x=-11/3

1 y=4
2 x=-3/2
3 x=11/3

1. 480/y-600/2y=480/y-300/y=180/y=45,则y=180/45=4
2. x/x+1=3x/3(x+1)=2x/3(x+1)+1,则x/3(x+1)=1,则x=3(x+1),则x=-3/2
3. x/(2x-3)-5/(3-2x)=x/(2x-3)+5/(2x-3)=(x+5)/(2x-3)=2,则x+5=2(2x-3),则x=11/3

480/y-600/2y=45 960-600=90y y=4
x/(x+1)=2x/3(x+1)+1 3x=2x+3(x+1) x=-3/2
x/(2x-3)-5/(3-2x)=2 x+5=2(2x-3) x=11/3

1. y=4
2. x=-3/2
3. x=11/3

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