Question

-2,5(5,7-х)=0. -х:(-2,4)=3,05
9цілих 1/2:19-12,7:(-10)+11цілих9/10:14=?

Answer 1

$- 2.5(5.7 - x) = 0 \\ 5.7 - x = 0 \\ x = 5.7$

$- x \div ( - 2.4) = 3.05 \\ - x = 3.05 \times( - 2.4) \\ - x = - 7.32 \\ x = 7.32$

$9 \frac{1}{2} \div 19 - 12.7 \div ( - 10) + 11 \frac{9}{10} \div 14 = \frac{19}{2 \times 19} + 1.27 + \frac{119}{10 \times 14} = 0.5 + 1.2 + 0.85 = 1.2 + 0.9 = 2.1$