16、计算:
(1) (2) (3)
(4) (5)
(6) (7)2a2-a(2a-5b)-b(2b+5a)
(8) (9)
(10) (11)4x(x-1)2+x(2x+5)(5-2x)
(12)(a+3b-2c)(a-3b-2c) (13)
(15)
(20)+(21)+(-4a) +(-5a)
(22)(m+1)(m+2)(m-1)(m-2) (23)
(24) (25)
(26) (27)
(5) (2)
(28) -3(x2-xy)-x(-2y+2x) (29)(3mn+1)(3mn-1)-(3mn-2)2
(30)4x(x-1)2+x(2x+5)(5-2x) (31)(a+3b-2c)(a-3b-2c)
2、先化简,再求值:(m+n)2+(m+n)(m-3n),其中m=3,n=2.
,其中
:,其中.
5、分解因式:
(1) 4a2b-4ab2+b3 (2) 25-16x2
(3) (4)
(5) (6)
(7) (8) (9)
(10). (11)
(12) (13)
(14) (15)
(16) (17)
(18) (19) 4(3a-2b)2-9(2a+3b)2;
(20) (21)
初一下因式分解 计算代数 来自淘豆网m.daumloan.com转载请标明出处.
