谁帮我解决两道初中数学因式分解题1.3a(a-b)+b(b-a) 2.6(x-y)的立方-3y(y-x)²3.x(x-y)(a-b)-y(y-x)(b-a)要过程 谢谢!
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谁帮我解决两道初中数学因式分解题1.3a(a-b)+b(b-a) 2.6(x-y)的立方-3y(y-x)²3.x(x-y)(a-b)-y(y-x)(b-a)要过程 谢谢!
谁帮我解决两道初中数学因式分解题
1.3a(a-b)+b(b-a)
2.6(x-y)的立方-3y(y-x)²
3.x(x-y)(a-b)-y(y-x)(b-a)
要过程 谢谢!
谁帮我解决两道初中数学因式分解题1.3a(a-b)+b(b-a) 2.6(x-y)的立方-3y(y-x)²3.x(x-y)(a-b)-y(y-x)(b-a)要过程 谢谢!
1.3a(a-b)+b(b-a) =3a(a-b)-b(a-b)=﹙a-b﹚﹙3a-b﹚
2.6(x-y)的立方-3y(y-x)²=6﹙x-y﹚³-3y﹙x-y﹚²=3﹙x-y﹚²﹙2-y﹚
3.x(x-y)(a-b)-y(y-x)(b-a)=x(x-y)(a-b)-y(x-y)(a-b)=(x-y)(a-b)﹙x-y﹚=﹙x-y﹚²﹙a-b﹚
1.3a(a-b)+b(b-a)=3a(a-b)-b(a-b)=(a-b)(3a-b)
2.6(x-y)³-3y(y-x)²=6(x-y)³-3y(x-y)²=3(x-y)²[2(x-y)-y]=3(x-y)²(2x-3y)
3.x(x-y)(a-b)-y(y-x)(b-a)=x(x-y)(a-b)-y(x-y)(a-b)=(x-y)(a-b)(x-y)=(x-y)²(a-b)
三次捞出鱼的总条数是40 25 35=100(条——
三次捞出鱼的总重量是40*2.5 25*2.2 35*2.8=253(kg)
三次捞出鱼的平均重量是253 /100=2.53(kg/条)
鱼苗10万,成活率为95%
所以总重大约是100000*95%*2.53=240350(kg)
所以估计鱼塘中鱼的总重量约是240350kg.
1.3a(a-b)-b(a-b)=(a-b)(3a-b)
2.6﹙x-y﹚³-3y﹙x-y﹚²=3﹙x-y﹚²﹙2-y﹚
3.x(x-y)(a-b)-y(x-y)(a-b)=(x-y)(a-b)﹙x-y﹚=﹙x-y﹚²﹙a-b﹚
3a(a-b)+b(b-a)=3a(a-b)-b(a-b)=(a-b)(3a-b)
6(x-y)的立方-3y(y-x)²=6(x-y)的立方-3y(x-y)²=3(x-y)²[2(x-y)-y]=3(x-y)²(2x-3y)
x(x-y)(a-b)-y(y-x)(b-a)=x(x-y)(a-b)-y(x-y)(a-b)=(x-y)(a-b)(x-y)=(x-y)²(a-b)
3a(a-b)+b(b-a)
=3a(a-b)-b(a-b)
=(a-b) (3a-b)
6(x-y)3-3y(y-x)²
=-6(y-x)3-3y(y-x)²
=(y-x)²(6x-6y-3y)
=(y-x)²(6x-9y)
.x(x-y)(a-b)-y(y-x)(b-a)
=.x(x-y)(a-b)-y(x-y)(a-b)
=.(x-y)²(a-b)
做任务、、、
1.3a(a-b)+b(b-a)=3a(a-b)-b(a-b)=(3a-b)(a-b)
2.6(x-y)的立方-3y(y-x)²=6(x-y)的立方-3y(x-y)²=(x-y)²(6x-6y-3y)=3(x-y)(x-y)(2x-3y)
3.x(x-y)(a-b)-y(y-x)(b-a)=x(x-y)(a-b)-y(x-y)(a-b)==0