分解公因式a的2n+3次方加上a的n+2次方加上a的n+1次方也是分解-1\2 x^2 y^3减去x^2 y+2x^3 y^2 z计算:(2a-5b)(3a^2-2ab+b^2)还有1题,不知是不是出卷老师傻了:因为3xy(2x-y)=6x^2 y-3xy^2,所以因式6x^2 y-
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分解公因式a的2n+3次方加上a的n+2次方加上a的n+1次方也是分解-1\2 x^2 y^3减去x^2 y+2x^3 y^2 z计算:(2a-5b)(3a^2-2ab+b^2)还有1题,不知是不是出卷老师傻了:因为3xy(2x-y)=6x^2 y-3xy^2,所以因式6x^2 y-
分解公因式a的2n+3次方加上a的n+2次方加上a的n+1次方
也是分解-1\2 x^2 y^3减去x^2 y+2x^3 y^2 z
计算:(2a-5b)(3a^2-2ab+b^2)
还有1题,不知是不是出卷老师傻了
:因为3xy(2x-y)=6x^2 y-3xy^2,所以因式6x^2 y-3xy^2=
分解公因式a的2n+3次方加上a的n+2次方加上a的n+1次方也是分解-1\2 x^2 y^3减去x^2 y+2x^3 y^2 z计算:(2a-5b)(3a^2-2ab+b^2)还有1题,不知是不是出卷老师傻了:因为3xy(2x-y)=6x^2 y-3xy^2,所以因式6x^2 y-
1.
a^(2n+3)+a^(n+2)+a^(n+1)
=a^(n+1)[a^(n+2)+a+1]
2.
-x^2y^3/2-x^2y+2x^3y^2z
=(-x^2y/2)(y^2+2+4xyz)
3.
(2a-5b)(3a^2-2ab+b^2)
=6a^3-4a^2b+2ab^2-15a^2b+10ab^2-4b^3
=6a^3-19a^2b+12ab^2-4b^3
4.
3xy(2x-y)=6x^2y-3xy^2=3xy(2x-y) 老师可能直接把答案写上了,
a的n+1次方*(a的n+2加上a+1)