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katenn
@katenn
July 2022
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Выполнить сложение и вычитание: а) (2а-5b)+(-3a+2b)
б) [tex]( 5^{3} - 3x^{2}-7) + (4+3 x^{2} - 5^{3} )[/tex]
в) [tex]( x^{2} - 3x)- (2x+1)[/tex]
г)[tex](- 2x^{2} - 3x+4)-(- 2x+ 7x-6)[/tex]
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olya115153
А) (2a-5b)+(-3a+2b)=2a-5b-3a+2b=-a-3b
б) (5³-3x²-7)+(4+3x²-5³)=5³-3x²-7+4+3x²-5³=-7+4=-3
в) (x²-3x)-(2x+1)=x²-3x-2x-1=x²-5x-1
г) (-2x²-3x+4)-(-2x+7x-6)=-2x²-3x+4+2x-7x+6=-2x²-8x+10
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Answers & Comments
б) (5³-3x²-7)+(4+3x²-5³)=5³-3x²-7+4+3x²-5³=-7+4=-3
в) (x²-3x)-(2x+1)=x²-3x-2x-1=x²-5x-1
г) (-2x²-3x+4)-(-2x+7x-6)=-2x²-3x+4+2x-7x+6=-2x²-8x+10