Bài 1: Trang 17 VBT toán 5 tập 1
Tính:
a) $\frac{7}{11}$ x $\frac{6}{5}$ = .....................
$3\frac{1}{3}$ x $5\frac{1}{4}$ = .......................
b) $\frac{6}{7}$ : $\frac{5}{2}$ = ........................
$2\frac{1}{3}$ : $1\frac{1}{4}$ = .........................
c) $\frac{3}{5}$ x $\frac{4}{7}$ x $1\frac{1}{2}$ = ...........................
Bài Làm:
a) $\frac{7}{11}$ x $\frac{6}{5}$ = $\frac{42}{55}$
$3\frac{1}{3}$ x $5\frac{1}{4}$ = $\frac{10}{3}$ x $\frac{21}{4}$ = $\frac{210}{12}$ = $\frac{35}{2}$
b) $\frac{6}{7}$ : $\frac{5}{2}$ = $\frac{6}{7}$ x $\frac{2}{5}$ = $\frac{12}{35}$
$2\frac{1}{3}$ : $1\frac{1}{4}$ = $\frac{7}{3}$ : $\frac{5}{4}$ = $\frac{7}{3}$ x $\frac{5}{4}$ = $\frac{28}{15}$
c) $\frac{3}{5}$ x $\frac{4}{7}$ x $1\frac{1}{2}$ = $\frac{3}{5}$ x $\frac{4}{7}$ x $\frac{3}{2}$ = $\frac{36}{70}$ = $\frac{18}{35}$