Question

Tính giá trị biểu thức

a. 35/4 - 5/8 + 5/2

b. 15/2 + 14/5 : 6/5 - 7/4

Answer 1

a.đáp án:85/8

b.đáp án:97/12

Answer 2

a) = 85/8

b) = 97/12 nha bn

Answer 3

\(a,\frac{35}{4}-\frac{5}{8}+\frac{5}{2}\)

\(=\frac{70}{8}-\frac{5}{8}+\frac{20}{4}\)

\(=\frac{65}{8}+\frac{20}{8}\)

\(=\frac{85}{8}\)

\(b,\frac{15}{2}+\frac{14}{5}:\frac{6}{5}-\frac{7}{4}\)

\(=\frac{15}{2}+\frac{14}{5}.\frac{5}{6}-\frac{7}{4}\)

\(=\frac{15}{2}+\frac{7}{3}-\frac{7}{4}\)

\(=\frac{90}{12}+\frac{28}{12}-\frac{21}{12}\)

\(=\frac{118}{12}-\frac{21}{12}\)

\(=\frac{97}{12}\)