1、(2x-5y) (4x-2y) 2、6a(a-4)-(2a-3)(3a+1) 3、(a-1)(a²+a+1
已知集合A{y/y平方-(a*a+a+1)y+a(a*a+1)>0} B{y/y=1/2x平方-x-5/2,0≤x≤3}
计算:"3y/x+y"+"y/y-x"+"2x/x^2-y^2" "a+2/a^2-4a+4"-"1/2a+4"-"a-
(1) 3a^3+6a^2+3a (2)x^2(x-y)+9(y-x) (3)(x^2+4)^2-16x^2 因式分解
分解公因式的题 x(a-x)(a-y)-y(x-a)(y-a)-ab(a-b)^2+a(b-a)^2a^3b-ab2ab
已知非空集合A={(x,y)|(a^2-1)x+(a-1)y=15,B={(x,y)|y=(5-3a)x-2a} 若A∪
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
初二下数学题!求解X-Y=4 则X-2XY-Y/3X+2XY-3Y=?A+1=5 则A*A/A*A*A*A+A*A+1=
因式分解:(1)(a+b)²+a+b+1/4 (2)6(x-y)²+3(y-x)³
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)
(a^2-3a+2)x^2+(2a^2-4a+1)xy+(a^2-a)y
同底数幂的乘方已知a^x=2,a^y=3,求(1)a^2x+y (2)a^x+3y