Question

thực hiện phép tính hợp lí

a, \(5\frac{3}{7}+\frac{7}{29}-0,7-\frac{3}{17}+\frac{22}{19}-2,3\)

b, \(0,375.\left(-1,5\right).\left(-4\right)^2\)

c, \(1\frac{1}{14}-\frac{7}{2}+2\frac{1}{14}:\left(\frac{-7}{2}\right)\)

d, \(\sqrt{0.36}-\sqrt{0,81}+\sqrt{0,49}\)

Answer 1

a) \(5\frac{3}{7}+\frac{7}{29}-0,7-\frac{3}{17}+\frac{22}{19}-2,3\)

\(=\frac{38}{7}+\frac{7}{29}-\frac{7}{10}-\frac{3}{17}+\frac{22}{19}-\frac{23}{10}\)

\(=\left(-\frac{7}{10}-\frac{23}{10}\right)+\frac{38}{7}+\frac{7}{29}-\frac{3}{17}+\frac{22}{19}\)

\(=\left(-3\right)+\frac{38}{7}+\frac{7}{29}-\frac{3}{17}+\frac{22}{19}\)

\(=\frac{17}{7}+\frac{7}{29}-\frac{3}{17}+\frac{22}{19}\)

\(=\frac{8605}{3451}+\frac{22}{19}\)

\(\approx4.\)

d) \(\sqrt{0,36}-\sqrt{0,81}+\sqrt{0,49}\)

\(=0,6-0,9+0,7\)

\(=\left(-0,3\right)+0,7\)

\(=0,4.\)

Chúc bạn học tốt!