Question

Tính rồi rút gọn

a,3+6/8-2/4

b,5/6-1/2+2

 

Answer 1

a) \(3-\frac{6}{8}-\frac{2}{4}\)

\(=\frac{18}{8}-\frac{6}{8}-\frac{4}{8}\)

\(=\frac{18-6-4}{8}\)

\(=\frac{8}{8}=1\)

b) \(\frac{5}{6}-\frac{1}{2}+2\)

\(=\frac{5}{6}-\frac{3}{6}+\frac{12}{6}\)

\(=\frac{5-3+12}{6}\)

\(=\frac{14}{6}=\frac{7}{3}\)

Answer 2

\(a.3+\frac{6}{8}-\frac{2}{4}\\ =\frac{3}{1}+\frac{6}{8}-\frac{2}{4}\\ =\frac{24}{8}+\frac{6}{8}-\frac{4}{8}\\ =\frac{24+6-4}{8}\\ =\frac{26}{8}\\ =\frac{13}{4}\)

\(b.\frac{5}{6}-\frac{1}{2}+2\\ =\frac{5}{6}-\frac{1}{2}+\frac{2}{1}\\ =\frac{5}{6}-\frac{3}{6}+\frac{12}{6}\\ =\frac{5-3+12}{6}\\ =\frac{14}{6}\\ =\frac{7}{3}\)

Answer 3

a)

\(3+\frac{6}{8}-\frac{2}{4}=\frac{3}{1}+\frac{6}{8}-\frac{2}{4}\)

\(=\frac{24}{8}+\frac{6}{8}-\frac{4}{8}\)

\(=\frac{24+6-4}{8}\)

\(=\frac{30-4}{8}\)

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

b) \(\frac{5}{6}-\frac{1}{2}+2\)

\(\frac{5}{6}-\frac{1}{2}+\frac{2}{1}\)

\(\frac{5}{6}-\frac{3}{6}+\frac{12}{6}\)

\(\frac{5-3+12}{6}\)

\(=\frac{14}{6}=\frac{7}{3}\)

Answer 4

helu:3