(4+X)/(40+X)=20%
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(4+X)/(40+X)=20%
(4+X)/(40+X)=20%
(4+X)/(40+X)=20%
很容易啊
(4+X)/(40+X)=20%=1/5
5*(4+X)=1*(40+X)
即20+5X=40+X
4X=-20
X=-5
(16x-13)/(4x-3)-(20x-24)/(4x-5)=(32x-30)/(8x-7)-(40x-43)/(8x-9)求x
解方程:3x-20+4x=x+40
4x+x=40x
x*x*(1/4)=20x
20%=(X+4)/(50+X)x=?(50g*8%)+(x*40%)=(50+x)20%,x=?
(4+X)/(40+X)=20%
40%x+20%x=4
x+3/20x=46 ,x-1/5x=40 ,x-1/2x=3/4 ,x-0.2x=18解方程
(16x-13)/(4x-3)+(40x-43)/(8x-9)=(32x-30)/(8x-7)+(20x-24)/(4x-5)....
(16x-13)/(4x-3)+(40x-43)/(8x-9)=(32x-30)/(8x-7)+(20x-24)/(4x-5)
(X+X*20%)-[(1200-X)-(1200-X)*20%]=40%
X+X*20%-(1200-X)-(1200-X)*20%=40%
4x-3x(20-x)=4求x
x-2=(104-x)+2 6x-59=10x-75 (x+10)+(x-15)=280-x4(x-62)=x-38 60x-40=(60+20)*(x-5) 32x+32*0.5-25x+64x=24x+496-49x x+15=3*(109-x ) 5(3x-1.4)=2(6x-0.5) 3(x+0.9)=5(x-1.7) 13x-4(2x+5)=17(x-2)-4(2x-1) (13x+8)/3=5x-1x-60=2[(3561-x)+100]+1 (x+9)+12=2[(x-9)-1
x+20%x =40
x+(x-20)=40
x+20%x=40
4x-3x(20-x)=5x