(1) a=2b+3 a=3b+20 (2) x-y=13 x=6y-7 (3)x-y=4 4x+2y=-1 (4)5x

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(1) a=2b+3 a=3b+20 (2) x-y=13 x=6y-7 (3)x-y=4 4x+2y=-1 (4)5x-y=110 9y-x=110 解方程组

1.a=2b+3 a=3b+20 =>2b+3=3b+20 =>b=-17 a=-31
2.x=6y-7带入 x-y=13 =>6y-7-y=13 =>y=4 x=17
3.x-y=4 =>x=y+4带入 4x+2y=-1 =>4(y+4)+2y=-1 =>y=-6/17 x=6/7
4.5x-y=110=>y=5x-110 带入9y-x=110 =>9(5x-110)-x=110 =>x=25 y=15

已知集合A={（x,y)| (y-3)/ (x-1)=2,x,y∈R},B={（x,y)| 4x+ay=16,x,y∈ (1) a=2b+3 a=3b+20 (2) x-y=13 x=6y-7 (3)x-y=4 4x+2y=-1 (4)5x 1、A={(x,y)|y=x平方-4x=5},B={(x,y)|y=2x平方-7},求A交B 1.设A={(x,y)/4x+y=6} B={(x,y)/3x+2y=7} 则A∩B等于多少设A={(x,y)|y=-2x+3,x,y∈R},B={(x,y)|y=(4-3m^2)x+1,x,y∈R},求A∩B≠ x²（x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3 已知集合A={(x,y)|2x+3y=6},B={(x,y)|x-2y=-4},求A∩B, 已知:6x²-7xy-3y²+14x+y+a=(2x-3y+b)(3x+y+1)求a,b的值 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x= 已知A=2x-4y,B=-2x的2次方+6x-3{y-x},求：{1}2A-B{2}3A-B 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x