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kri19
@kri19
October 2021
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решите пожалуйста )))
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Charlotta2842
1)2(x-y)²=2(x²-2xy+y²)=2x²-4xy+2y²
2)1,2(a+3b)²=1,2(a²+6ab+9b²)=1,2a²+7,2ab+10,8b²
3)(y-5)²-(y-2)=(y²-10y+25)-y+2=y²-11y+27
4)(x-7)x+(x+3)²=x²-7x+(x²+6x+9)=x²-7x+x²+6x+9=2x²-x+9
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Answers & Comments
2)1,2(a+3b)²=1,2(a²+6ab+9b²)=1,2a²+7,2ab+10,8b²
3)(y-5)²-(y-2)=(y²-10y+25)-y+2=y²-11y+27
4)(x-7)x+(x+3)²=x²-7x+(x²+6x+9)=x²-7x+x²+6x+9=2x²-x+9