Question

Tính theo 3 cách khác nhau:

a) 3/4 : 1/2 : 16/15

b) 5/6 : (1/2 x 3/4)

Answer 1

a) Cách 1: \(\frac{3}{4}:\frac{1}{2}:\frac{16}{15}=\frac{3}{2}:\frac{16}{15}=\frac{45}{32}\)

Cách 2: \(\frac{3}{4}:\frac{1}{2}:\frac{16}{15}=\frac{3}{4}:\frac{16}{15}:\frac{1}{2}=\frac{45}{64}:\frac{1}{2}=\frac{45}{32}\)

Cách 3: \(\frac{3}{4}:\frac{1}{2}:\frac{16}{15}=\frac{3}{4}:\left(\frac{1}{2}\times\frac{16}{15}\right)=\frac{3}{4}:\frac{8}{15}=\frac{45}{32}\)

b) Cách 1: \(\frac{5}{6}:\left(\frac{1}{2}\times\frac{3}{4}\right)=\frac{5}{6}:\frac{3}{8}=\frac{20}{9}\)

Cách 2: \(\frac{5}{6}:\left(\frac{1}{2}\times\frac{3}{4}\right)=\frac{5}{6}:\frac{1}{2}:\frac{3}{4}=\frac{5}{3}:\frac{3}{4}=\frac{20}{9}\)

Cách 3: \(\frac{5}{6}:\left(\frac{1}{2}\times\frac{3}{4}\right)=\frac{5}{6}:\frac{3}{4}:\frac{1}{2}=\frac{10}{9}:\frac{1}{2}=\frac{20}{9}\)