提公因式法:(1)6a3b2-10ab3c; (2)-3ma3+12ma2-18ma; (3)6x(a-b)+9y (b-a); (4)4q(1-p)3+6(p-1)2;运用公式法:(1)4x2-0.25y2; (2)-16+a2b2; (3)4(2x-y)2-9 y 2;(4)4(x+2y)2-9(x-y)2; (5)-16+x4y4; (6)4x2+y2-4xy; ( 7)9-12a+4a2; (8 )(m+n)2-6(m+n)+9; (9) 4(a-b)2-4(b-a)+1;(10) (x+y)2-4(x+y-1) ; (11)a3-ab2 (12)2a2-18 (13)a3-9a;(14)(a-b)b2-4(a-b) (15)(x-1)+b2(1-x); (16)3m(2x-y)2-12mn2; (17)8a3-8a2+ 2a (18)ab3+2a2b2+a3b ; (19)m2-mn+mx-nx;(20)(x2+y2)2-4x2y2; (21)(x2+6x)2+18(x2+6x)+81 (22)x2-2xy+y2-9. (23)x2-xy+4x-4y (24)a2-b2-c2+2bc利用简便法计算:(1)23×2.718+59×2.718+18×2.718. (2)992 +198+1. (3)2 0162-4 034×2 016+2 0172. (4)9972-32分式的有关运算:(1) (2) (3) ; (4) . (5) (6) (7) ; (8) ; (9) ; (10) ; (11) ;(12) ; (13)已知 ,求w;(14)÷; (15) ÷; (16)÷; (17)÷; (18) ; (19 ) ; (20) ; (21)(-2016)0-2-2--(-3)2;解下列分式程:(1) ; (2) ; (3) |