Question

4．列式计算如表9个数的和．

1$\frac{1}{5}$	1$\frac{2}{5}$	2$\frac{3}{5}$
2$\frac{1}{5}$	2$\frac{2}{5}$	2$\frac{3}{5}$
3$\frac{1}{5}$	3$\frac{2}{5}$	3$\frac{3}{5}$

Answer 1

分析 同分母分数相加（减），分子进行相加（减）得数作分子，分母不变；依此计算即可求解．

解答 解：1$\frac{1}{5}$+1$\frac{2}{5}$+2$\frac{3}{5}$+2$\frac{1}{5}$+2$\frac{2}{5}$+2$\frac{3}{5}$+3$\frac{1}{5}$+3$\frac{2}{5}$+3$\frac{3}{5}$
=（1×2+2×4+3×3）+$\frac{1×3+2×3+3×3}{5}$
=19+3$\frac{3}{5}$
=22$\frac{3}{5}$

点评 考查了分数的加法运算，关键是熟练掌握计算法则正确进行计算．