Ответ:
[tex]1) (a+b)^2=a^2+2ab+b^2\\2) (5-x)^2=25-10x+x^2=x^{2} -10x+25\\3) (7x+3y)^2=49x^{2} +42xy+9y^2[/tex]
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Ответ:
[tex]1) (a+b)^2=a^2+2ab+b^2\\2) (5-x)^2=25-10x+x^2=x^{2} -10x+25\\3) (7x+3y)^2=49x^{2} +42xy+9y^2[/tex]