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man0090
@man0090
August 2021
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Последнее задание плз
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ilyxa12let
A)-3a+7b-7a+2b=-10a+9b=9b-10a
при а=-0,8 b=5/9
9*5/9-10*-0,8=5+8=13
б)7х^2-8xy+y^2-2x^2+8xy-3y^2=5x^2+4y^2
при x=-2 y=1/2
5*(-2)^2+4*(1/2)^2=5*4+4*1/4=20+1=21
в)-2x+3x-7x+6x=9x-9x=0
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Answers & Comments
при а=-0,8 b=5/9
9*5/9-10*-0,8=5+8=13
б)7х^2-8xy+y^2-2x^2+8xy-3y^2=5x^2+4y^2
при x=-2 y=1/2
5*(-2)^2+4*(1/2)^2=5*4+4*1/4=20+1=21
в)-2x+3x-7x+6x=9x-9x=0