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Автор - sergeirotar95

помогите пж срочно по алгебре 8 класс ​

Ответ

Проверено экспертом

Автор - NNNLLL54

(x+sqrt{y})(x+sqrt{y})=(x+sqrt{y})^2=x^2+2xsqrt{y}+y\\\(sqrt{x}+sqrt{xy})^2=x+2sqrt{x^2y}+xy=x+2xsqrt{y}+xy=x(1+y+2sqrt{y})\\\(3sqrt6-2sqrt3)^2=9cdot 6-2cdot 3sqrt6cdot 2sqrt3+4cdot 3=54-12sqrt{18}+12=\\=66-36sqrt2=6cdot (11-6sqrt2)\\\(4sqrt5-7sqrt5)^2=Big (sqrt5cdot (4-7)Big )^2=Big (sqrt5cdot (-3)Big )^2=5cdot 9=45

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