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TacoMan2530
@TacoMan2530
January 2020
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Sejam as equações 2x-7=11 e 3y-7sobre5+ysobre4=-4sobre15 em que x é y são números reais.Qual é o valor da expressão \sqrt{x} +27y(y ao quadrado)? A) 37 b)47 c)43 d)39 e)39
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albertrieben
Bom dia Taco
2x - 7 = 11
2x = 11 + 7 = 18
x = 9
(3y - 7)/5 + y/4 = -4/15
mmc(4,5,15) = 60
36y - 84 + 15y + 16 = 0
51y = 84 - 16
51y = 68
3*17y = 4*17
y = 4/3
x = 9
E = √x + 27y²
E = 3 + 27*16/9
E = 3 + 3*16 = 3*17 = 51 (E)
.
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2x - 7 = 11
2x = 11 + 7 = 18
x = 9
(3y - 7)/5 + y/4 = -4/15
mmc(4,5,15) = 60
36y - 84 + 15y + 16 = 0
51y = 84 - 16
51y = 68
3*17y = 4*17
y = 4/3
x = 9
E = √x + 27y²
E = 3 + 27*16/9
E = 3 + 3*16 = 3*17 = 51 (E)
.