\(-\frac{1}{3}\)<\(\frac{14}{36}\)<\(\frac{9}{8}\)<\(-\frac{1}{4}\)

1: Rút gọn

a) \(-\dfrac{33}{51}=\dfrac{-33:3}{51:3}=\dfrac{-11}{17}\)

b) \(\dfrac{156}{-168}=\dfrac{-156}{168}=\dfrac{-156:12}{168:12}=\dfrac{-13}{14}\)

c) \(\dfrac{-75}{-100}=\dfrac{75}{100}=\dfrac{75:25}{100:25}=\dfrac{3}{4}\)

2: Quy đồng mẫu:

a) \(-\dfrac{3}{8}\) và \(\dfrac{5}{4}\)

MSC: 8

\(-\dfrac{3}{8}=\dfrac{-3}{8}\)

\(\dfrac{5}{4}=\dfrac{5\cdot2}{4\cdot2}=\dfrac{10}{8}\)

b) \(\dfrac{-7}{6}\) ; \(\dfrac{5}{12}\) và \(-\dfrac{5}{6}\)

MSC: 12

\(-\dfrac{7}{6}=\dfrac{-7\cdot2}{6\cdot2}=\dfrac{-14}{12}\)

\(\dfrac{5}{12}=\dfrac{5}{12}\)

\(\dfrac{-5}{6}=\dfrac{-5\cdot2}{6\cdot2}=\dfrac{-10}{12}\)

\(\frac{\text{-7}}{\text{6}}:x=\frac{\text{3}}{\text{7}}\)

=>\(x=\frac{\text{-7}}{\text{6}}:\frac{\text{3}}{\text{7}}\)

=> x = \(-2\frac{\text{13}}{\text{18}}\)

Vậy x = \(-2\frac{\text{13}}{\text{18}}\)

x=-49/18

a.-0.875

b.-0.5

Chắc bạn ấn nhầm dấu + thành dấu =.

`4/9:(-1/7)+6-5/9÷(-1/7)`

`=4/9×(-7)-5/9×(-7)+6`

`=5/9×7-4/9×7+6`

`=7×(5/9-4/9)+6`

`=7×1/9+6`

`=7/9+6`

`=6 7/9`

\(\dfrac{1}{3}:x=-4\)

        \(x=\dfrac{1}{3}:4\)

        \(x=\dfrac{1}{12}\)

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