几道解公因式题!急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!急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!急
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!急1.(2a+b)(a-3b)+a(2a+b)2.(ab+b)^2-(a+1)^23.(x+y+z)^2-(x-y+z)^2
1,原式=(2a+b)(a-3b+a)
=(2a+b)(2a-3b)
2,原式=b^2(a+1)^2-(a+1)^2
=(b^2-1)(a+1)^2
3,原式={(x+y+z)+(x-y+z)}{(x+y+z)-(x-y+z)}
=(2x+2z)*2y
=4y(x+y)