早教吧作业答案频道 -->数学-->
1.5a(m-n)-10a(m-n)2.(x+y)²(x-y)+(x+y)(x-y)²3.x²y²-0.044.-m²+1/165.9a²-12a+46.4x²+20xy+25y²7.x²+7x+128.x²-4xy-96y²
题目详情
▼优质解答
答案和解析
1.5a(m-n)-10a(m-n)
=-5a(m-n)
2.(x+y)²(x-y)+(x+y)(x-y)²
=(x+y)(x-y)(x+y+x-y)
=2x(x+y)(x-y)
3.x²y²-0.04
=(xy+0.2)(xy-0.2) (平方差)
4.-m²+1/16
=-(m+1/4)(m-1/4) (平方差)
5.9a²-12a+4
=(3a-2)^2 (完全平方)
6.4x²+20xy+25y²
=(2x+5y)^2 (完全平方)
7.x²+7x+12
=(x+3)(x+4) (交叉相乘)
8.x²-4xy-96y²
=(x+8y)(x-12y) (交叉相乘)
=-5a(m-n)
2.(x+y)²(x-y)+(x+y)(x-y)²
=(x+y)(x-y)(x+y+x-y)
=2x(x+y)(x-y)
3.x²y²-0.04
=(xy+0.2)(xy-0.2) (平方差)
4.-m²+1/16
=-(m+1/4)(m-1/4) (平方差)
5.9a²-12a+4
=(3a-2)^2 (完全平方)
6.4x²+20xy+25y²
=(2x+5y)^2 (完全平方)
7.x²+7x+12
=(x+3)(x+4) (交叉相乘)
8.x²-4xy-96y²
=(x+8y)(x-12y) (交叉相乘)
看了1.5a(m-n)-10a(m...的网友还看了以下:
急求这几道一元一次方程的解11x/2+(64-2x)/6=(100-9x)/815-(8-5x)/ 2020-05-14 …
mathematica中将两个函数画在一张图中,为什么不行啊?f1 = If[x < 10000, 2020-05-16 …
(x+1)/5-4+9-3+8=x-2怎么算 2020-05-16 …
急救,关于概率密度的问题设随机变量X的概率密度为f(x)=1/3,0《=x《=1;2/9,3《=x 2020-06-05 …
1.x/3.5+9=3.5+92.4(3x+2)-22.43.x+2x+10=2804.x+9=3 2020-07-22 …
(1)阅读小明解方程的过程并回答问题.解方程:2x+93=x+2.解:去分母,得2x+9=3(x+ 2020-07-29 …
1/x(x+3)+1/[(x+3)(x+6)]+1/[(x+6)(x+9)]=1/3*(1/x-1/ 2020-10-31 …
(1)10y+7=22y-5-3y(2)3.5x-5=0.5x+10-2x(3)7x-2(4-x)= 2020-10-31 …
下列题目x=多少3(x-2.1)=99x+11x=0.4(x-5)÷6=1.67(x+1.2)=8. 2020-10-31 …
2(x-3)^2=x^2-9解方程1:2(x-3)^2=(x+3)(x-3)2(x-3)=x+3x= 2020-10-31 …