8x+2y+(5x-2y) X^2+(-3x^2-2y+1) 3a-(4b-2a+1)
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
8x+2y+(5x-2y) X^2+(-3x^2-2y+1) 3a-(4b-2a+1)
已知集合A={(x,y)| (y-3)/ (x-1)=2,x,y∈R},B={(x,y)| 4x+ay=16,x,y∈
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
5a+2b+(3a-2b) -3x-(x+1)+(4x+2) -2/1(x+y)+3/1(x-y)
计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)
3a(x+y)-2b(x+y)=(x+y)(?)
设A={(x,y)|3x+2y=1},B={(x,y)|x-y=2},C={(x,y)|2x-2y=3},D={(x,y
1.x(x-y)+y(y-x)2.9(a-b)^2-16(a+b)^2 3.25(x-y)^2+10(y-x)+1
设A={(x,y)|y=-2x+3,x,y∈R},B={(x,y)|y=(4m-3{m}^{2})x+1,x,y∈R},
数学二元一次方程 (x-y=2,2x+y=4 ) (x-y=1,3x-y=5) (x-y=8,3x+y=12 ) (a+