分解因式分解因式紧急20[标签：分解因式,]□寂寞边境□离问题结束还有15天0小时1.3ab^2-3a^2b2.-9ab+18a^2b^2-27a^3b^33.1/4-1/9x^24.9(x-y)^2-4(x-y)^25.5(x-y)^3+10(y-x)^26.4x^2-20xy+25y^27.-x^2+4xy-6y^28.(a+b)^2+10c(a

Question

分解因式
分解因式
紧急 20 [ 标签：分解因式,] □寂寞边境□ 离问题结束还有15天0小时
1.3ab^2-3a^2b
2.-9ab+18a^2b^2-27a^3b^3
3.1/4-1/9x^2
4.9(x-y)^2-4(x-y)^2
5.5(x-y)^3+10(y-x)^2
6.4x^2-20xy+25y^2
7.-x^2+4xy-6y^2
8.(a+b)^2+10c(a+b)+25c
9.(a-2)^2+4(a-2)+4
10.(2^2+y^2)^2-4x^2y^2
11.1-4a^2-9b^2+12ab

Answer 1

1:=3ab(b-a) 2:=-9ab(1-2ab+3a^2b^2) 3:=(1\2+1\3x)(1\2-1\3x)
4:=[3(x+y)]^2-[2(x-y)]^2=(3x+3y+2x-2y)(3x+3y-2x+2y)=(5x+y)(x+5y)
5 :=5(x-y)^3+10(x-y)^2=5(x-y)^2(x-y+2) 6:=(2x-5y)^2
7:这个题目你抄错了吧 8：=（a+b+5c)^2
9:=(a-2+2)^2=a^2 10:=(x^2-y^2)^2 11:=1-(4a^2-12ab+9b^2)=1-(2a-3b)^2=(1+2a-3b)(1-2a+3b)