2X-4分之5X-4=3X-6分之2X+5-1/2

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2X-4分之5X-4=3X-6分之2X+5-1/2
2X-4分之5X-4=3X-6分之2X+5-1/2

2X-4分之5X-4=3X-6分之2X+5-1/2
(5x-4)/(2x-4)=(2x+5)/(3x-6)-1/2
两边乘6(x-2)
15x-12=4x+10-3x+6
15x-12=x+16
14x=28
x=2
经检验,x=2时,分母x-2=0,增根,舍去
所以方程无解

0.08x5x(40%x30/7-2/7)x2.5
=0.4x2.5x(12/7-2/7)
=1x10/7
=10/7
X2-3XY-2Y2=2Y2
X2-3XY-4Y2=0
(X-4Y)(X+Y)=0
X=4Y,X=-Y
Y/X=1/4,Y/X=-1