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daschenka26
@daschenka26
June 2022
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найдите значения выражения
1) (a+b)²+(a-b)² при а=(-2), b=2
2) (x+y)²- (x-y)² при x=0,5, y=(-0,5)
3) (a+0,5b)²- (0,5a+b)² при а=3, b=(-2)
4) (0,75x-0,25y)²- (0,25x+0,75y)² при x=16, y=(-16)
пожалуйста помогите срочно надо!
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Answers & Comments
ADILINA26
1) a²+2ab+b²+a²-2ab+b²=(-2)²+2×(-2)×2+2²+(-2)²-2×(-2)×2+2²=4-8+4+2+8+4=14
2)x²+2xy+y²-x²-2xy+y²=0,5²+2×0,5×(-0,5)+(-0,5)²-0,5²-2×0,5×(-0,5)+(-0,5)² =0,25-0,5-0,25-0,25+0,5+0,5=0,25
3) a²+ab+b²-a²-ab+b²=2b²=8
2 votes
Thanks 2
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Answers & Comments
2)x²+2xy+y²-x²-2xy+y²=0,5²+2×0,5×(-0,5)+(-0,5)²-0,5²-2×0,5×(-0,5)+(-0,5)² =0,25-0,5-0,25-0,25+0,5+0,5=0,25
3) a²+ab+b²-a²-ab+b²=2b²=8