已知1/X-1/Y=3,求代数式2X+3XY-2Y/X-2XY-Y的值如题,要有运算过程
2019-05-07
已知1/X-1/Y=3,求代数式2X+3XY-2Y/X-2XY-Y的值
如题,要有运算过程
优质解答
1/X-1/Y=3
2X+3XY-2Y/X-2XY-Y
分子分母同除以xy
=(2/y+3-2/x)/(1/y-2-1/y)
=(2*3+3)/(1*3-2)
=9/1
=9
1/X-1/Y=3
2X+3XY-2Y/X-2XY-Y
分子分母同除以xy
=(2/y+3-2/x)/(1/y-2-1/y)
=(2*3+3)/(1*3-2)
=9/1
=9