Question

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Answer 1

$a, \frac{15}{y - 2} = \frac{3}{7} \frac{15}{y - 2} = \frac{15}{35} y - 2 = 35 y = 35 + 2 y = 37 V ậ y y = 37 b, y \times \frac{3}{4} + y \times \frac{1}{4} - y = 99 y \times (\frac{3}{4} + \frac{1}{4} - 1) = 99 y \times 0 = 99 (v ô l ý) V ậ y k h ô n g c ó y c, \frac{y}{2} + \frac{y}{3} + \frac{y}{6} = 1 y \times (\frac{1}{2} + \frac{1}{3} + \frac{1}{6}) = 1 y \times 1 = 1 y = 1 V ậ y y = 1 d, \frac{2}{y - 5} = \frac{3}{4} 3 \times (y - 5) = 2 \times 4 3 \times (y - 5) = 8 y - 5 = \frac{8}{3} y = 5 + \frac{8}{3} y = \frac{23}{3} V ậ y y = \frac{23}{3} e, \frac{y - 3}{6} = \frac{1}{2} \frac{y - 3}{6} = \frac{3}{6} y - 3 = 3 y = 3 + 3 y = 6 V ậ y y = 6 \frac{8}{5} - y : \frac{1}{2} = 1 y : \frac{1}{2} = \frac{8}{5} - 1 y : \frac{1}{2} = \frac{3}{5} y = \frac{3}{5} \times \frac{1}{2} y = \frac{3}{10} V ậ y y = \frac{3}{10}$ ..

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Answer 2

$a, \frac{15}{y - 2} = \frac{3}{7} \frac{15}{y - 2} = \frac{15}{35} y - 2 = 35 y = 35 + 2 y = 37 V ậ y y = 37 b, y \times \frac{3}{4} + y \times \frac{1}{4} - y = 99 y \times (\frac{3}{4} + \frac{1}{4} - 1) = 99 y \times 0 = 99 (v ô l ý) V ậ y k h ô n g c ó y c, \frac{y}{2} + \frac{y}{3} + \frac{y}{6} = 1 y \times (\frac{1}{2} + \frac{1}{3} + \frac{1}{6}) = 1 y \times 1 = 1 y = 1 V ậ y y = 1 d, \frac{2}{y - 5} = \frac{3}{4} 3 \times (y - 5) = 2 \times 4 3 \times (y - 5) = 8 y - 5 = \frac{8}{3} y = 5 + \frac{8}{3} y = \frac{23}{3} V ậ y y = \frac{23}{3} e, \frac{y - 3}{6} = \frac{1}{2} \frac{y - 3}{6} = \frac{3}{6} y - 3 = 3 y = 3 + 3 y = 6 V ậ y y = 6 \frac{8}{5} - y : \frac{1}{2} = 1 y : \frac{1}{2} = \frac{8}{5} - 1 y : \frac{1}{2} = \frac{3}{5} y = \frac{3}{5} \times \frac{1}{2} y = \frac{3}{10} V ậ y y = \frac{3}{10}$ ..

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