Question

\(\left(-2\right)^3.\left(\frac{3}{4}-0,25\right):\left(2\frac{1}{4}-1\frac{1}{6}\right)\)

Answer 1

\(\left(-2\right)^3.\left(\frac{3}{4}-0,25\right):\left(2\frac{1}{4}-1\frac{1}{6}\right)\)

\(=-8.\left(\frac{3}{4}-\frac{1}{4}\right):\left(\frac{9}{4}-\frac{7}{6}\right)\)

\(=-8.\frac{1}{2}:\left(\frac{54}{24}-\frac{28}{24}\right)\)

\(=-4:\frac{13}{12}\)

\(=-4.\frac{13}{12}\)

\(=\frac{-13}{3}\)

Answer 2

\((-2)^3\cdot(\frac{3}{4}-0,25):(2\frac{1}{4}-1\frac{1}{6})\)

\(=-8\cdot(0,75-0,25):(\frac{9}{4}-\frac{7}{6})\)

\(=-8\cdot0,5:\frac{13}{12}\)

\(=-8\cdot0,5\cdot\frac{12}{13}\)

\(=-4\cdot\frac{12}{13}=-\frac{48}{13}=-3\frac{9}{13}\)

\(=2\frac{4}{13}\)

\(\text{Bài toán này .... tính mất công }:)\text{ Bạn dùng máy tính thử kiểm tra có đúng không ?}\)