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Giovannalopesrock
@Giovannalopesrock
December 2019
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Qual o valor de a^2 - 5ab + 7b^2 - 9b^2 + 4ab - a^2 + 2b^2, quando a= 15 e b= -17?
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valsantina
Substituindo os valores temos:
15²-5.15.(-17)+7.(-17)²-9.(-17)²+4.15.(-17)-15²+2.(-17)²
225+1275+7.289-9.289-1020-225+2.289=
cancelar o 225 com - 225
1275+2023-2601-1020+578=
3298-3621+578=
-323+578= 255
2 votes
Thanks 1
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Lista de comentários
15²-5.15.(-17)+7.(-17)²-9.(-17)²+4.15.(-17)-15²+2.(-17)²
225+1275+7.289-9.289-1020-225+2.289=
cancelar o 225 com - 225
1275+2023-2601-1020+578=
3298-3621+578=
-323+578= 255