Question

Решите пожалуйста 1,2 номер

Answer 1

▪1. a)
$frac{3b - 2}{1 - 2b} = frac{3 times 1 frac{1}{6} - 2}{1 - 2 times ( - 1 frac{1}{6}) } = frac{3 times frac{7}{6} - 2}{1 - 2 times (- frac{ {7} }{6} )} = frac{ frac{7}{2} - 2}{1 + frac{7}{3} } = frac{3 frac{1}{2} - 2}{1 + 2 frac{1}{3} } = frac{1 frac{1}{2} }{ 3 frac{1}{3} } = frac{ frac{3}{2} }{ frac{10}{3} } = frac{9}{20} = 0.45$
▪1. б)
$4x + 3y = 4 times 1.2 + 3 times ( - 2.1) = frac{4 times 12}{10} - frac{3 times 21}{10} = frac{48 - 63}{10} = - frac{15}{10} = - 1.5$

▪2. а)

$frac{2 - 3b}{6b - 3} = frac{2 - 3 times 0.6}{6 times ( - 0.6) - 3} = frac{2 - 1.8}{ - 3.6 - 3} = frac{0.2}{ - 6.6} = - frac{ frac{2}{10} }{ frac{66}{10} } = - frac{2 times 10}{10 times 66} = - frac{1}{33}$

▪2. б)

$3x + 4y = 3 times 2 frac{5}{6} + 4 times ( - 2 frac{3}{8} ) = 6 frac{3 times 5}{6} - 8 frac{4 times 3}{8} = 6 frac{ {5} }{2} - 8 frac{3}{2} = 8 frac{1}{2} - 9 frac{1}{2} = - 1$