若1/X-1/Y=3,求2X+3XY-2Y/X-2XY-Y的值?最好能让人容易理解
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若1/X-1/Y=3,求2X+3XY-2Y/X-2XY-Y的值?最好能让人容易理解若1/X-1/Y=3,求2X+3XY-2Y/X-2XY-Y的值?最好能让人容易理解若1/X-1/Y=3,求2X+3XY
若1/X-1/Y=3,求2X+3XY-2Y/X-2XY-Y的值?最好能让人容易理解
若1/X-1/Y=3,求2X+3XY-2Y/X-2XY-Y的值?
最好能让人容易理解
若1/X-1/Y=3,求2X+3XY-2Y/X-2XY-Y的值?最好能让人容易理解
1/X-1/Y=3
通分得到
(y-x)/xy=3
化简
y-x=3xy
(2X+3XY-2Y)÷(X-2XY-Y)
=[3xy-2(y-x)]÷[-2XY-(Y-X)]
=(3xy-6xy)÷(-2xy-3xy)
=-3xy/-5xy
=3/5
最简单的方法
(2x+3xy-2y)/(x-2xy-y)
分子分母同时除以xy,得:
=[(2/y-2/x)+3]/[(1/y-1/x)-2]
=[-2(1/x-1/y)+3)/[-(1/x-1/y)-2]
=(-6+3)/(-3-2)
=3/5
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