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Vasilecojocari
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va rog frumos ... 11) (√7x+y)²=.... 12) (3xy-2)=².....13)(5y-2)²=...14)(7x-3)²=....15)(2x-2y)²

Răspuns :

Renatemambouko
11) (√7x+y)²=7+2√7xy+y²
12) (3xy-2)²=9x²y²-12xy+4
13)(5y-2)²=25y²-20y+4
14)(7x-3)²=49x²-42x+9
15)(2x-2y)²=4x²-8xy+4y²