Đáp án+Giải thích các bước giải:
a)4 $\frac{2}{5}$ + 3 $\frac{1}{10}$
=$\frac{22}{5}$ + $\frac{31}{10}$ =$\frac{44}{10}$ + $\frac{31}{10}$
=$\frac{75}{10}$ =$\frac{15}{2}$
b)7 $\frac{3}{8}$ + 5 $\frac{1}{4}$ = $\frac{59}{8}$ + $\frac{21}{4}$
=$\frac{59}{8}$ + $\frac{42}{8}$
=$\frac{101}{8}$
c)3 $\frac{2}{9}$ x 4 $\frac{3}{5}$ = $\frac{29}{9}$ x $\frac{23}{5}$
=$\frac{667}{45}$
d)5 $\frac{3}{2}$ : 4 $\frac{1}{2}$ = $\frac{13}{2}$ : $\frac{9}{2}$
=$\frac{13}{2}$ x $\frac{2}{9}$
=$\frac{26}{18}$
= $\frac{13}{9}$
