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2014-09-02T12:01:20+03:00
A)a^2-b^2=(a+b)(a-b)=5*7=35
b)a^2+2ab+b^2=(a+b)^2=5^2=25
c)a^2-2ab+b^2=(a-b)^2=7^2=49
3 5 3