\(\dfrac{73}{40}\): (\(\dfrac{7}{12}\)+\(\dfrac{94}{15}\))

= \(\dfrac{73}{40}\):(\(\dfrac{35}{60}\)+\(\dfrac{376}{60}\))

= \(\dfrac{73}{40}\):\(\dfrac{137}{20}\)

= \(\dfrac{73}{40}\). \(\dfrac{20}{137}\)

= \(\dfrac{73.20}{40.137}\)

= \(\dfrac{73}{274}\)

\(\left(12,375-10,55\right):\left(\dfrac{7}{12}+6\dfrac{4}{15}\right)\)

\(=1,825:\left(\dfrac{7}{12}+\dfrac{94}{15}\right)\)

\(=\dfrac{1825}{1000}:\left(\dfrac{7.5}{60}+\dfrac{94.4}{60}\right)\)

\(=\dfrac{73}{40}:\left(\dfrac{35+376}{60}\right)\)

\(=\dfrac{73}{40}:\dfrac{411}{60}\)

\(=\dfrac{73}{40}:\dfrac{137}{20}\)

\(=\dfrac{73}{40}.\dfrac{20}{137}\)

\(=\dfrac{73}{274}\)

\(\left(12,375-10,55\right):\left(\dfrac{7}{12}+6\dfrac{4}{15}\right)\\ =1,825:\left(\dfrac{7}{12}+\dfrac{94}{15}\right)\\ =\dfrac{73}{40}:\dfrac{137}{20}=\dfrac{73}{40}.\dfrac{20}{137}=\dfrac{73}{274}\)

-41/28

-7/30

47/20

-11/8

1/2

31/72

-40/39

Tải PHOTOMATH bạn nhé

mình sẽ làm giúp bạn nha!                                                                                                                                                                        32.53+47.15+7.45= (32.53) + (47.15) + (7.45) =1696 + 705 + 315 = 2716                                                                                                 ( Chú ý là : Trong bt có +; -; .; : ;ta phải thực hiện nhân chia trước cộng rừ sau nha)

1: =1/5-1/4=-1/20

2: =6/8-7/8=-1/8

3: =11/18-14/18=-3/18=-1/6

4: =-28/210+90/210+28/210=3/7

5: =-8/17-34/17=-42/17

1)\(\dfrac{1}{5}+\dfrac{-1}{-4}=\dfrac{4}{20}+\dfrac{5}{20}=\dfrac{9}{20}\)

\(\)2)\(\dfrac{3}{4}+\dfrac{-7}{8}=\dfrac{6}{8}+\dfrac{-7}{8}=\dfrac{-1}{8}\)

3)\(\dfrac{11}{18}+\dfrac{-7}{9}=\dfrac{11}{18}+\dfrac{-14}{18}=\dfrac{-3}{18}=\dfrac{-1}{6}\)

4)\(\dfrac{2}{-15}+\dfrac{3}{7}+\dfrac{-4}{-30}=\dfrac{-2}{15}+\dfrac{2}{15}+\dfrac{3}{7}=0+\dfrac{3}{7}=\dfrac{3}{7}\)

5)\(\dfrac{8}{-17}+\left(-2\right)=\dfrac{-8}{17}+\dfrac{-34}{17}=\dfrac{-42}{17}\)

Thế này hửm :v