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1)a^2+ab+ax+bx
2)x+y-x^2-xy
3)6m-12-2n+mn
4)4ab^2+5ab+a
1)a^2+ab+ax+bx
2)x+y-x^2-xy
3)6m-12-2n+mn
4)4ab^2+5ab+a
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a²+ab+ax+bx=а(а+в)+х(а+в)=(а+в)(а+х)x+y-x²-xy=(х+у)-х(х+у)=(х+у)(1-х)
6m-12-2n+mn=6(m-2)+n(m-2)=(m-2)(6+n)
4ab²+5ab+a=a(4b²+5b+1)=a(4b²+4b+b+1)=a((4b(b+1)+(b+1))=a(4b+1)(b+1)