Question

4．列式計算如表9個數(shù)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 同分母分數(shù)相加（減），分子進行相加（減）得數(shù)作分子，分母不變；依此計算即可求解．

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$\frac{3}{5}$

點評 考查了分數(shù)的加法運算，關(guān)鍵是熟練掌握計算法則正確進行計算．