若x-3y=-5,则2x+3-6y=
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若x-3y=-5,则2x+3-6y=
![若x-3y=-5,则2x+3-6y=](/uploads/image/z/3459217-49-7.jpg?t=%E8%8B%A5x-3y%3D-5%2C%E5%88%992x%2B3-6y%3D)
2x+3-6y = 2 (x - 3y) + 3 = 2×(-5)+ 3 = -7
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若5x+3y=3x+4y=x+2y+6,则x+y=___
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若x/y=4/3 则3x+2y/2x-5y=
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
若全集I={(x,y)|x,y∈R},集合M={(x,y)|(y-3)/(x-2)},N{(x,y)|y=x=1},则(
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
若x-2y=5,则式子12-x+2y=.以知3x-4y=2x+y则x∶y=