ребяттт помогите пожалуйста :333 прошуууу. Created by lizabloger. matematika-ru

ребяттт помогите пожалуйста :333 прошуууу...

manyny06

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(х+3)² = х² +2*Х*3 + 3² = х²+6х+9
(5-у)² = 5²-2*5*у+у² = 25-10у+у²
(2п-7)² = (2п)² - 2*2п*7 +7² = 4п²-28п+49
(3х+2у)² = (3х)² + 2*3х*2у+(2у)² = 9х²+12ху+4у²

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CVita $(x+3)^2=x^2+6x+9 \\ (5-y)^2=25-10y+y^2 \\ (2n-7)^2=4n^2-28+49 \\ (3x+2y)^2=9x^2+12xy+4y^2$

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