(1) (1/2x+2/3y)(-2/3y+1/2x) (2) (-1-2a)(2a-1) (3) (2a+1)(4a^
计算:"3y/x+y"+"y/y-x"+"2x/x^2-y^2" "a+2/a^2-4a+4"-"1/2a+4"-"a-
1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y)
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
(1)计算:a-(a^2)/(a+1)-1 (2)计算:3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)
已知集合A={(x,y)|(y-3)/(x-2)=a+1}B={(x,y)|(a^2-1)x+(a-1)y=15},当a
(1/2)已知实数x,y,a满足:根号(x+y-8)+根号(8-x-y)=根号(3x-y-a)+根号(x-2y+a+3)
计算:3a(a²-2a+1)-2a²(a-3) (2x-3y)(x+y)
设x,y,a都是实数,并且|x|=1-a,|y|=(1-a)(a-1-a^2),则|x|+y+a^3
y=x^2cosx+3奇偶性y=a^x-1/a^x+1奇偶性
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
(3x-y)(3x+y)+y(x+y);(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)快点,