计算:3a(a²-2a+1)-2a²(a-3) (2x-3y)(x+y)
计算:3a(a²-2a+1)-2a²(a-3) (2x-3y)(x+y)
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)
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-(a^2)/(a+1)-1 (2)计算:3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)
计算,不要过程(-2x)(-3x²)²-3a(2a²-5a-1)(2x+3y)(2x-3y
计算和分解因式计算(x+1)(x²+1)(x⁴+1)(x-1)(3+2a-y)(2a+y-3)分解
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
计算下列分解因式:(2a+b)(2a-3b)-3a(2a+b) x(x+y)(x-y)-x(x+y)2次方
计算:x-y分之x - x+y分之y + x²-y²分之2xy 计算:a-1分之2a+2 除以 (a
计算 1.[(a+b)^2-(a+b)(a-b)]÷(-b) 2.[(x+y)(2x+y)+(x+y)(x-y)]÷3x
已知集合A={y|y=log1/2 (x-x²)},B={x|a^(x-3)≤(1/a)^(2x-9),a>0
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