Question

Đã trả lời bởi chuyên gia

Answer 1

Ta có: x + $\frac{3}{2} = \frac{- 12}{- 6}$
=> x = $\frac{12}{6} - \frac{3}{2}$
=> x = $\frac{12}{6} - \frac{9}{6} = \frac{3}{6} = \frac{1}{2}$
Vậy x = $\frac{1}{2}$
Bài 6
a) $- \frac{1}{3} \times \frac{5}{9} = - \frac{1 \times 5}{3 \times 9} = - \frac{5}{27}$
b) $- \frac{3}{7} \times \frac{5}{15} = - \frac{3}{7} \times \frac{1}{3} = - \frac{3 \times 1}{7 \times 3} = \frac{1}{7}$
c) $- \frac{7}{3} \times \frac{9}{21} = - \frac{7}{3} \times \frac{3}{7} = - \frac{7 \times 3}{3 \times 7} = - 1$
d) $- \frac{5}{6} \div \frac{2}{7} = - \frac{5}{6} \times \frac{7}{2} = - \frac{5 \times 7}{6 \times 2} = - \frac{35}{12}$
e) $- \frac{4}{7} \div - \frac{1}{3} = - \frac{4}{7} \times - \frac{3}{1} = \frac{12}{7}$
f) $- 10 \div \frac{2}{3} = - 10 \times \frac{3}{2} = - \frac{10 \times 3}{2} = - \frac{30}{2} = - 15$
g) $\frac{2}{5} + \frac{3}{5} \times - \frac{10}{21} = \frac{2}{5} + \frac{3 \times (- 10)}{5 \times (21)} = \frac{2}{5} - \frac{30}{105} = \frac{42}{105} - \frac{30}{105} = \frac{12}{105} = \frac{4}{35}$
h) $- \frac{4}{5} \div \frac{2}{7} + \frac{4}{7} = - \frac{4}{5} \times \frac{7}{2} + \frac{4}{7} = - \frac{28}{10} + \frac{4}{7} = - \frac{98}{35} + \frac{20}{35} = - \frac{78}{35}$

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Answer 2

Ta có: x + $\frac{3}{2} = \frac{- 12}{- 6}$
=> x = $\frac{12}{6} - \frac{3}{2}$
=> x = $\frac{12}{6} - \frac{9}{6} = \frac{3}{6} = \frac{1}{2}$
Vậy x = $\frac{1}{2}$
Bài 6
a) $- \frac{1}{3} \times \frac{5}{9} = - \frac{1 \times 5}{3 \times 9} = - \frac{5}{27}$
b) $- \frac{3}{7} \times \frac{5}{15} = - \frac{3}{7} \times \frac{1}{3} = - \frac{3 \times 1}{7 \times 3} = \frac{1}{7}$
c) $- \frac{7}{3} \times \frac{9}{21} = - \frac{7}{3} \times \frac{3}{7} = - \frac{7 \times 3}{3 \times 7} = - 1$
d) $- \frac{5}{6} \div \frac{2}{7} = - \frac{5}{6} \times \frac{7}{2} = - \frac{5 \times 7}{6 \times 2} = - \frac{35}{12}$
e) $- \frac{4}{7} \div - \frac{1}{3} = - \frac{4}{7} \times - \frac{3}{1} = \frac{12}{7}$
f) $- 10 \div \frac{2}{3} = - 10 \times \frac{3}{2} = - \frac{10 \times 3}{2} = - \frac{30}{2} = - 15$
g) $\frac{2}{5} + \frac{3}{5} \times - \frac{10}{21} = \frac{2}{5} + \frac{3 \times (- 10)}{5 \times (21)} = \frac{2}{5} - \frac{30}{105} = \frac{42}{105} - \frac{30}{105} = \frac{12}{105} = \frac{4}{35}$
h) $- \frac{4}{5} \div \frac{2}{7} + \frac{4}{7} = - \frac{4}{5} \times \frac{7}{2} + \frac{4}{7} = - \frac{28}{10} + \frac{4}{7} = - \frac{98}{35} + \frac{20}{35} = - \frac{78}{35}$

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