如果方程x(ax+2)=0的两根是x=0,x=4,那么a=________.
已知x=,y=,求(2x+3y)2-(2x-3y)2的值.
分解因式:a2(x-y)2-b2(y-x)2.
计算:5752×12-4252×12=_________.
4a3-a分解因式得( )
A.a(2a+1)(2a-1) B.a(4a+1)(4a-1)
C.a(2a-1)2 D.a(4a2-1)
将多项式a(x-y)+2by-2bx分解因式,正确的结果是( )
A.(x-y)(-a+2b) |
B.(x-y)(a+2b) |
C.(x-y)(a-2b) |
D.-(x-y)(a+2b) |