Question

1) -9/10 × -5/3 × 2/3 =_________
2) -3 1/5 × 3/8 ×1/3 = _________
3) 1/5 [5/11 + 6/11 ] = _________
4) - 1/4 ÷ [ 4/5 × -7/8 ] = _________

please do it tell me answer ​

Answer 1

$1. \frac{ - 9}{10} \times \frac{ - 5}{3} \times \frac{2}{3} \\ = \frac{( - 9) \times ( - 5) \times 2}{10 \times 3 \times 3} \\ = \frac{45 \times 2}{90} = \frac{90}{90} = 1.$

$3. \frac{1}{5} ( \frac{5}{11} + \frac{6}{11} ) \\ = \frac{1}{5} ( \frac{11}{11} ) = \frac{1}{5} \times 1 \\ = \frac{1}{5} .$

$2. \frac{ - 31}{5} \times \frac{3}{8} \times \frac{1}{3} \\ = \frac{( - 31) \times 3 \times 1}{5 \times 8 \times 3} \\ = \frac{( - 91) \times 1}{120} = \frac{ - 91}{120} .$

$4 .\frac{ - 1}{4} \div ( \frac{4}{5} \times \frac{ - 7}{8} ) \\ = \frac{ - 1}{4} \ \div ( \frac{4 \times ( - 7)}{5 \times 8} ) \\ = \frac{ - 1}{4} \div ( \frac{ - 28}{40} ) \\ = \frac{ - 1}{4} \times \frac{ - 40| }{28} \\ = \frac{ - 40}{28 \times 4} = \frac{ - 40}{112} .$