Question

(3,618:1,8-2,1)*5/9:0,02

Answer 1

$(3.618 \div 1.8 - 2.1) \times \frac{5}{9} \div 0.02 = - 2.5\\ \\ 1) \: \: \: 3.618 \div 1.8 = \frac{3618}{1800} = \frac{201}{100} = 2.01 \\ 2) \: \: \: 2.01 - 2.1 = - 0.09 \\ 3) \: \: \: - 0.09 \times \frac{5}{9} = - \frac{9 \times 5}{100 \times 9} = - \frac{5}{100} \\ 4) \: \: \: - \frac{5}{100} \div 0.02 = - \frac{5}{100} \div \frac{2}{100} = - \frac{5 \times 100}{100 \times 2} = - \frac{5}{2} = - 2 \frac{1}{2} = - 2.5$

Answer 2

(3,618:1,8-2,1)*5/9:0,02 = (2,01-2,1) * 5/9 : 1/50 = - 0,09 * 5/9 * 50 = - 9/100 * 5/9 * 50 = - 1/20 * 50 = - 1/2 * 5 = - 5/2 = - 2,5