Question

представьте в виде выражения
49-2ax-a^2-x^2
81a^2+6bc-9b^2-c^2
1-25x^2+10xy-y^2

Answer 1

49-2ax-a^2-x^2=49-(a+x)²=(7-a-x)(7+a+x)
81a^2+6bc-9b^2-c^2=81a²-(3b-c)=(9a-3b+c)(9a+3b-c)
1-25x^2+10xy-y^2=1-(5x-y)²=(1-5x+y)(1+5x-y)