1)a)(a2-9)=(a-3)*(a+3)
b)4-a2b2=(2-ab)*(2+ab)
v)1/16a2-b4=(1/4a-b2)*(1/4a+b2)
2)(2a+b)*(2a-b)=4a2-2ab+2ab-b2(сокрашается -2ab i +2ab)=4a2-b2
3)xz+yz/x2+y2=z(x+y)/(x-y)*(x+y)=z/x-u
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Answers & Comments
1)a)(a2-9)=(a-3)*(a+3)
b)4-a2b2=(2-ab)*(2+ab)
v)1/16a2-b4=(1/4a-b2)*(1/4a+b2)
2)(2a+b)*(2a-b)=4a2-2ab+2ab-b2(сокрашается -2ab i +2ab)=4a2-b2
3)xz+yz/x2+y2=z(x+y)/(x-y)*(x+y)=z/x-u