Question

1 ) a+b , para a = 1/3 e b = -1/5
2) 2x - y , para x = 7 e y = -1/2
3) x²- yz , para x = -1/2 , y = 1/3 e z = 1/4

Answer 1

Resposta:

1)

$a + b = \frac{1}{3} + ( - \frac{1}{15}) = \frac{ - 15 - 1}{45} = \frac{ - 16}{45} \\ b)2x - y = 2 \times 7 - ( - \frac{1}{2}) = 14 + \frac{1}{2} = 17 \div 2 = 7 \\ c)x {}^{2} - yz =</p><p> ( - \frac{1}{2} ) ^{2} - \frac{1}{3} \times \frac{1}{4}= </p><p> \frac{1}{4} - \frac{1}{12} = </p><p>\frac{(12 \div 4) \times 1}{12} - \frac{(12 \div 12) \times 1}{12} = \frac{3 - 1}{12} = </p><p>\frac({2}{12} ) \div 2 = </p><p>\frac{1}{6}$