Question

2. Rezultatul calculului ( - 1 supra 90 ) : ( - 1 supra 30) - ( - 3 supra 5 ) ⁻¹ este :
A. 4 B. 1 C. 3 D. 2

Answer 1

$(- \frac{1}{90} ):(- \frac{1}{30} )-(- \frac{3}{5} )^-^1= \frac{1}{90} \cdot 30+ \frac{5}{3} = \frac{30}{90} + \frac{5}{3} = \frac{30}{90} + \frac{150}{90} = \frac{180}{90} =2$