(1)(﹣0.5x)分之0.2x减y
=(0.2x-y)/(-0.5x)
=(2x-10y)/-5x
=(10y-2x)/5x
(2)负五分之一x减三分之一y分之负二分之一x加y
=(-x/2+y)/(-x/5-y/3)
=(-15x+30y)/(-6x-10y)
=(15x-30y)/(6x+10y)
x-0.5y/1/3x + Y
= 3(X-0.5Y)/(x +3 y)
=(3X-1.5Y)/(x +3 y)
> =(6X-1612),/(2×+6 Y)
= 3(2X-Y)/ 2(x +3 y)
0.3M-0.2N / M +0.5?
=(3M-2N)/(10 +5 N)
=(3M-2N)/ 5(2M + N)