6(3x+5y)+7x-5y при x+Y =3

Question

6(3x+5y)+7x-5y при x+Y =3

Answer 1

=18х+30у+7х-5у=25х+25у

х+у=3    х=3-у

25х+25у=25(3-у)+25у=75-25у+25у=75

Comments

Спасибо

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Answer 2

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Comments

Спасибо