求几道初一的因式分解~
1.5m^2(a-b-c)+20m^4(b+c-a)
2.a^4-1/2a^2x^2y^2+1/16x^4y^4
3.9(x+3y)^2-25(x-3y)^2
4.4(2x-y)^2+21-12(2x-y+1)
人气:105 ℃ 时间:2020-05-20 17:36:55
解答
1.
5m^2(a-b-c)+20m^4(b+c-a)
=5m^2(a-b-c)-20m^4(a-b-c)
=5m^2(a-b-c)(1-4m^2)
=5m^2(a-b-c)(1+2m)(1-2m)
2.
a^4-1/2a^2x^2y^2+1/16x^4y^4
=(a^2-1/4x^2y^2)^2
=(a+1/2xy)^2(a-1/2xy)^2
3.
9(x+3y)^2-25(x-3y)^2
=[3(x+3y)+5(x-3y)][3(x+3y)-5(x-3y)]
=(8x-6y)(-2x+6y)
=(-4)(4x-3y)(x-3y)
4.
4(2x-y)^2+21-12(2x-y+1)
=4[(2x-y+1)-1]^2-12(2x-y+1)+21
=4(2x-y+1)^2-8(2x-y+1)+4-12(2x-y+1)+21
=4(2x-y+1)^2-20(2x-y+1)+25
=[2(2x-y+1)-5]^2
=(4x-2y-3)^2
推荐
猜你喜欢
- I was so excited on my first day of Air Force pilot training that I couldn't help,honestly speaking______
- 在三角形ABC中,AD是角平分线,E为AB上一点,AE=AC,过点E作EF平行A交BC于F,求证DF=DC
- 质量为M=5t的汽车拖着质量m=1t的拖车,在笔直的公路上以v=10m/s的速度匀速前进,运动中汽车和拖车受到的阻力都是其重力的0.1倍.某一时刻,拖车脱钩,而汽车驾驶员发现时汽车已行驶了110m,司机立即关闭油门让汽车减速行驶,求汽车和拖
- 国庆期间,商场促销,甲商场九折优惠,乙商场消费100元,反10元,定价相同,用500
- nonbody knows where he is now.what do you suppose___him?
- 辐射的具体含义和实质是什么?
- It is less likely that an earthquake will happen in Chongqing,according to a report __________ the urban quake risks of
- He usually gets home at 5:00.(用at 5:30改成选择问句)