(1)-a×(-a)2×(-a)3=a6; (2)(-a3)2=a6; (3)(3x3y)2=9x6y2; (4)(-a)3÷a2=-a; (5)x3y2×(-6x2y)=-9x5y3; (6)(-3a2+b2-1)×(1-2a)=6a3-3a2+2a-1+b2-2ab2; (7)(a-5)(5+a)=a2-25; (8)(x+6)(x-2)=x2+4x-12; (9)(a+3b)2=a2+6ab+9b2; (10)(2x-y)2=4x2-2xy+y2; (11)(-4a3+12a4b-7a4b2)÷(-4a3)=1-3ab+ab2. |