已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/05 18:42:26
已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y
已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y
已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y
分子 分母同时除以 xy
则 分子得 2(1/x+1/y)-3=2*5-3=7
分母得 3(1/x+1/y)+2=3*5+2=17
则 得 7/17
∵1/x+1/y=5
∴(x+y)/xy=5
∴x+y=5xy
∴原式=2(x+y)-3xy/3(x+y)+2xy
=10xy-3xy/15xy+2xy
=7/17
已知1/x+1/y=5
即x+y=5xy
2x-3xy+2y/3x+2xy+3y
=10x-15xy+10y/15x+10xy+15y
=10x-3(x+y)+10y/15x+2(x+y)+15y
=7(x+y)/17(x+y)
=7/17
【数学】已知 1/x-1/y=3 求 5x-xy-5y / x-2xy-y=?已知 1/x=1/y 求 2x-3xy-2y / x-2xy-y=?
已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y
已知1/x-1/y=5,求分式2x+5xy-2y/3x-xy-3y
已知1/x+1/y=1/2,求代数式3x-5xy+3y/-x+3xy-y
已知1/x-1/y=3,求5x+3xy-5y/x-2xy-y的值
已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值
已知1/x-1/y=3,求5x+3xy-5y/x-2xy-y的值.
已知1/x-1/y=3,求5x+3xy-5y/x-2xy-y的值
已知1/X-1/y=3,求(5x+3xy-5y)/(x-2xy-y)的值
已知1/x-1/y=2,求5x+3xy-5y/x-2xy-y
已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值.
已知1/x+1/y=3,求(3x-5xy+3y)/(x-2xy+y)
已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值.
已知1/x+1/y=3,求3x-2xy+3y/x+5xy+y的值
已知1/x+1/y=5 求2x-3xy+2y/x+2xy+y
已知1/x-1/y=2,求x-y-5xy/2x-2y+3xy
已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值如题.
已知:1/X+1/Y=5,求 2x-3xy+2y/x+2xy+y的值,