1( )(-2X+3Y)=9Y^2-4X^22若(a-2b)^2=9,(2a+b)^2=25,求a^2+b^2,ab的值
ab是有理数a*b=2a-3b求【(x-y)*(x+y)】*x的值
已知a^x-y*a^2y+1=a^11,且b^x-1*b^4-y=b^5,求(x^2)*y的值
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
(x-A)*(B-y)=x^2-9xy+8y^2,求A,B
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
已知|x-y-3|+(a+b+4)²=0,求2a+2b-(a+b)分之(x-y)²-3(y-x)的值
单项式A,B满足等式2x(A-3x)=4x的平方y+B,求A,B
几道因式分解..4ab(a+b)^2-6a^2b(a+b)(x+y)^2(x-y)+(x+y)(x-y)^22a(a-3
已知A=2x-4y,B=-2x的2次方+6x-3{y-x},求:{1}2A-B{2}3A-B
3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy
已知:6x²-7xy-3y²+14x+y+a=(2x-3y+b)(3x+y+1)求a,b的值