.列式子十字相法式分解
(1)x2 -x -2 (2)x2 + x 2
(3) x2 x-6 (4) x2 + x-6
(5)x2 -x -12 (6)x2 + x 12
(7)x2 -x -20 (8)x2 + x -20
(9)x2 -x -56 (10)x2 + x -56
(11) x2 + 2x-3 (12) x2 2x-3
(13) x2 2x-8 (14)x2 + 2x-8
(15) x2 2x-15 (16) x2 + 2x15
(17) x2 2x-24 (18) x2 + 2x 24
(19) x2 -3x -4 (20) x2 + 3x -4
(21) x2 -3x + 2 (22) x2 + 3x + 2
(23) x2 -3x -10 (24) x2 + 3x -10
(25) x2 -3x -18 (26) x2 + 3x -18
(27) x24x + 3 (28)x2 + 4x + 3
(29) x24x5 (30)x2 + 4x 5
(31)x24x12 (32) x2 + 4x 12
(33) x24x21 (34) x2 + 4x 21
(35) (36)
(37) (38)
(39)x2 + 6x + 5 (40) x2 6x + 5
(41) 2x2 +x3 (42)2x2 x 3
(43)2x2 +2x4 (44) 2x2 2x4
(45)2x2 +3x+1 (46)2x2 3x+1
(47)2x2 +5x+2 (48)2x2 5x+2
(49)2x2 +5x-7 (50)2x2 5x-7
(51)2x2 +7x+3 (52)
(53) 3x2 -4x+1 (54) 3x2 + 4x+1
(55) 3x2 -5x+2 (56) 3x2 + 5x+2
(57) 3x2 -7x+2 (58) 3x2 + 7x+2
(59)4x2 -5x+1 (60)4x2 + 5x+1
(61)5x2 -3x-2 (62)5x2 + 3x-2
(63)6x2 -7x-5 (64) 6x2 +7x-5
二练练做做:1列式分解式:
(1) (2)
(3) (4)(a+b)2 +5(a+b)-36
2列式式分解
(1) (2)
(3) (4)
3列式式分解
(1) (2)2x2 +5x+2
(3))3x2 +7x-6 (4)2x2-5xy+2y2
4式分解法列列方程
(1)2x2-7x + 6 0 (2)x(x-2) 3 (3) (2x-3)2 + 3(2x-3) + 2 0
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