a \(1\dfrac{1}{3}+\left(\dfrac{2}{3}-\dfrac{3}{4}\right)-\left(0,8+1\dfrac{1}{5}\right)\) b \(\left(\dfrac{3}{4}\div1\dfrac{1}{2}\right)-\left(\dfrac{5}{6}\div\dfrac{1}{3}\right)\) c \(\left(-0,4\right)+2\dfrac{2}{5}\times\left[\left(\dfrac{-2}{3}\right)+\dfrac{1}{2}\right]^2\) ...
Đọc tiếp
a \(1\dfrac{1}{3}+\left(\dfrac{2}{3}-\dfrac{3}{4}\right)-\left(0,8+1\dfrac{1}{5}\right)\) b \(\left(\dfrac{3}{4}\div1\dfrac{1}{2}\right)-\left(\dfrac{5}{6}\div\dfrac{1}{3}\right)\) c \(\left(-0,4\right)+2\dfrac{2}{5}\times\left[\left(\dfrac{-2}{3}\right)+\dfrac{1}{2}\right]^2\) d \(\left(\dfrac{7}{8}-0,25\right)\div\left(\dfrac{5}{6}-0,75\right)^2\)
\(a,1\dfrac{1}{3}+\dfrac{2}{3}-\dfrac{3}{4}-0,8+1\dfrac{1}{5}\)
\(=2-\dfrac{3}{4}-\dfrac{4}{5}+\dfrac{6}{5}\)
\(=\dfrac{5}{4}-\dfrac{4}{5}+\dfrac{6}{5}\)
\(=\dfrac{33}{20}\)
\(b,\dfrac{3}{4}:1\dfrac{1}{2}-\dfrac{5}{6}:\dfrac{1}{3}\)
\(=\dfrac{1}{2}-\dfrac{5}{2}\)
\(=-2\)
\(c,\left(-0,4\right)+2\dfrac{2}{5}.\left(-\dfrac{2}{3}\right)+\dfrac{1}{2}\)
\(=-\dfrac{2}{5}+\left(-\dfrac{8}{5}\right)+\dfrac{1}{2}\)
\(=-2+\dfrac{1}{2}\)
\(=-\dfrac{3}{2}\)
\(d,\dfrac{7}{8}-0,25:\dfrac{5}{6}-0,75\)
\(=\dfrac{7}{8}-\dfrac{3}{10}-\dfrac{3}{4}\)
\(=-\dfrac{7}{40}\)