Ответ:
(2х+3y)^2=(2x+3y)*(2x+3y)=4x^2+6xy+6xy+9y^2
Сократим.
4x^2+6xy+6xy+9y^2=4x^2+12xy+9y^2
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Ответ:
(2х+3y)^2=(2x+3y)*(2x+3y)=4x^2+6xy+6xy+9y^2
Сократим.
4x^2+6xy+6xy+9y^2=4x^2+12xy+9y^2