Question

Câu 1: thực hiện các phép tính (bằng cách hợp lí nếu có thể) (tinh ra tung buoc giup mk nha)

a) -3/1/2.1/13/32 b) 2/4/7:(-1/13/14)

c) -3/8.5/11+6/11.-3/8+2/3/8 d) 12/3/14-(2/4/5+8/3/14)

Câu 2: Tìm X

-3/5.x+7/6 = 5/4

giúp mk với mk cần rất gấp

Answer 1

Câu 1:

a) = \(\dfrac{-7}{2}\) x \(\dfrac{45}{32}\) = \(\dfrac{-315}{64}\)

b) = \(\dfrac{18}{7}\) : \(\dfrac{-27}{14}\) = \(\dfrac{18}{7}\) x \(\dfrac{14}{-27}\) = \(\dfrac{-4}{3}\)

c) = \(\dfrac{-3}{8}\) x ( \(\dfrac{5}{11}\) + \(\dfrac{6}{11}\) + 2 ) = \(\dfrac{-3}{8}\) x 3 = \(\dfrac{-9}{8}\)

Câu 2:

\(\dfrac{-3}{5}\) . x + \(\dfrac{7}{6}\) = \(\dfrac{5}{4}\)

\(\Leftrightarrow\) \(\dfrac{-3}{5}\) . x = \(\dfrac{5}{4}\) - \(\dfrac{7}{6}\)

\(\Leftrightarrow\) \(\dfrac{-3}{5}\) . x = \(\dfrac{1}{12}\)

\(\Leftrightarrow\) x = \(\dfrac{1}{12}\) : \(\dfrac{-3}{5}\)

\(\Leftrightarrow\) x = \(\dfrac{-5}{36}\)