海上遇到风暴电影:帮下做数学题~~
(5)x2+9x+8 (6)x2-10x+24 (7)x2+3x-10 (8)x2-3x-28
(9)a2+4a-21 (10)m2+4m-12 (11)p2-8p+7 (12)b2+11b+28
(13)x2y2+8xy+12 (14)a2b2-7ab+10 (15)m3-m2-20m
(16)3a3b-6a2b-45ab (17)a6b-a2b5 (17)256x4y6-81y2z4
把(z3-x2-y2)2-4x2y2分解因式
把x4-5x2+4分解因式
都是分解因式啊 ~~~谢谢字母后面是次方
⑴a-a3
=a(1-a2)
=a(1-a)(1+a)
⑵x3y-xy3
=xy(x2-y2)
=xy(x+y)(x-y)
⑶4x3y3-9xy
=xy(4x2y2-9)
=xy(2xy+3)(2xy-3)
⑷4x2-8x-12y-9y2
=(4x2-9y2)-(8x+12y)
=(2x+3y)(2x-3y)-4(2x+3y)
=(2x+3y)(2x-3y-4)
⑸x2+9x+8
=(x+1)(x+8)
⑹x2-10x+24
=(x-4)(x-6)
⑺x2+3x-10
=(x-2)(x+5)
⑻x2-3x-28
=(x+4)(x-7)
⑼a2+4a-21
=(a-3)(a+7)
⑽m2+4m-12
=(m-2)(m+6)
⑾p2-8p+7
=(p-1)(p-7)
⑿b2+11b+28
=(b+4)(b+7)
⒀x2y2+8xy+12
=(xy+2)(xy+6)
⒁a2b2-7ab+10
=(ab-2)(ab-5)
⒂m3-m2-20m
=m(m2-m-20)
=m(m+4)(m-5)
⒃3a3b-6a2b-45ab
=3ab(a2-2a-15)
=ab(a+3)(a-5)
⒄a6b-a2b5
=a2b(a4-b4)
=a2b(a2+b2)(a2-b2)
=a2b(a2+b2)(a+b)(a-b)
⒅256x4y6-81y2z4
=y2(256x4y4-81z4)
=y2(16x2y2+9z2)(16x2y2-9z2)
=y2(16x2y2+9z2)(4xy+3z)(4xy-3z)
⒆(z3-x2-y2)2-4x2y2
=(z3-x2-y2+2xy)(z3-x2-y2-2xy)
=[z3-(x2-2xy+y2)][z3-(x2+2xy+y2)]
=[z3-(x-y)2][z3-(x+y)2]
⒇x4-5x2+4
=(x2-1)(x2-4)
=(x+1)(x-1)(x+2)(x-2)
x4-5x2+4
=(x-1)(x+1)(x-2)(x+2)
(1)a-a3
=a(a-1)(a+1)
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