几道解公因式题!1.(2a+b)(a-3b)+a(2a+b)2.(ab+b)^2-(a+1)^23.(x+y+z)^2-(x-y+z)^2

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几道解公因式题!1.(2a+b)(a-3b)+a(2a+b)2.(ab+b)^2-(a+1)^23.(x+y+z)^2-(x-y+z)^2
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几道解公因式题!1.(2a+b)(a-3b)+a(2a+b)2.(ab+b)^2-(a+1)^23.(x+y+z)^2-(x-y+z)^2
几道解公因式题!
1.(2a+b)(a-3b)+a(2a+b)
2.(ab+b)^2-(a+1)^2
3.(x+y+z)^2-(x-y+z)^2

几道解公因式题!1.(2a+b)(a-3b)+a(2a+b)2.(ab+b)^2-(a+1)^23.(x+y+z)^2-(x-y+z)^2
1.乘开得:4a^2-4ab-3b^2=(2a+b)(2a-3b)
2.第一项提个b^2得:b^2(a+1)^2-(a+1)^2=(a+1)^2(b^2-1)
3.x+z看成一项,(x+z)^2+2(x+z)y+y^2-(x+z)^2+2(x+z)y-y^2=4(x+z)y