解方程:(2a-3)^3=(2a+1)(2a-1)-21.已知:(a+b)^2=7,(a-b)^2=4,求a^2+b^2和ab的值2.(a+b)(a-b)+(a+b)^2-2a(a+b)3.分解因式:(1) (a-b)(a^2+2a+4) (2) (2x-y)(4x^2+2xy+4y^2)直接用公式:(1) (3x-2y)(9x^2+6xy+4y^2)(2) (2m-3)(
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