拜托给50个八年级因式分解题目啊~~~【简单一点的0O(∩
答案:2 悬赏:50 手机版
解决时间 2021-02-23 13:33
- 提问者网友:niaiwoma
- 2021-02-22 19:16
拜托给50个八年级因式分解题目啊~~~【简单一点的0O(∩
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- 五星知识达人网友:西岸风
- 2021-02-22 19:54
到书店看去,======以下答案可供参考======供参考答案1:1.(3a-b)2-4(3a-b)(a+3b)+4(a+3b)2=[3a-b-2(a+3b)]^2=(a-7b)^22.(a+3)2-6(a+3)=(a+3)(a-3) 3(x+1)2(x+2)-(x+1)(x+2)2=-(x+1)(x+2) 4.abc+ab-4a=a(bc+b-4)5.16x2-81=(4x+9)(4x-9)6.9x2-30x+25=(3x-5)^27.x2-7x-30=(x-10)(x+3) 8.x2-25=(x+5)(x-5) 9.x2-20x+100=(x-10)^2 10.x2+4x+3=(x+1)(x+3)11.4x2-12x+5=(2x-1)(2x-5)12.3ax2-6ax=3ax(x-2)13.x(x+2)-x=x(x+1)14.x2-4x-ax+4a=(x-4)(x-a)15.25x2-49=(5x-9)(5x+9) 16.36x2-60x+25=(6x-5)^2 17.4x2+12x+9=(2x+3)^218.x2-9x+18=(x-3)(x-6)19.2x2-5x-3=(x-3)(2x+1)20.12x2-50x+8=2(6x-1)(x-4)21.(x+2)(x-3)+(x+2)(x+4)=(x+2)(2x-1)22.2ax2-3x+2ax-3= (x+1)(2ax-3) 23.9x2-66x+121=(3x-11)^224.8-2x2=2(2+x)(2-x)25.x2-x+14 =整数内无法分解 26.9x2-30x+25=(3x-5)^227.-20x2+9x+20=(-4x+5)(5x+4)28.12x2-29x+15=(4x-3)(3x-5) 29.36x2+39x+9=3(3x+1)(4x+3) 30.21x2-31x-22=(21x+11)(x-2) 31.9x4-35x2-4=(9x^2+1)(x+2)(x-2)32.(2x+1)(x+1)+(2x+1)(x-3)=2(x-1)(2x+1)33.2ax2-3x+2ax-3=(x+1)(2ax-3) 34.x(y+2)-x-y-1=(x-1)(y+1)35.(x2-3x)+(x-3)2=(x-3)(2x-3) 36.9x2-66x+121=(3x-11)^2 37.8-2x2=2(2-x)(2+x)38.x4-1=(x-1)(x+1)(x^2+1)39.x2+4x-xy-2y+4=(x+2)(x-y+2) 40.4x2-12x+5=(2x-1)(2x-5) 41.21x2-31x-22=(21x+11)(x-2)42.3x2-6x=3x(x-2)43.49x2-25=(7x+5)(7x-5)44.6x2-13x+5=(2x-1)(3x-5)45.x2+2-3x=(x-1)(x-2) 46.12x2-23x-24=(3x-8)(4x+3) 47.(x+6)(x-6)-(x-6)=(x-6)(x+5)48.3(x+2)(x-5)-(x+2)(x-3)=2(x-6)(x+2)49.9x2+42x+49=(3x+7)^2 。还有这; https://wenku.baidu.com/view/e9929a3d5727a5e9856a61e4.html 十字相乘法看这 https://baike.baidu.com/view/198055.htm希望对你有帮助,不懂还可问,满意请及时采纳!祝你学习进步!o(∩_∩)ook3w_ad
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- 1楼网友:迟山
- 2021-02-22 20:13
我也是这个答案
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