Question

5．直接寫出得數(shù)．

9-2$\frac{1}{8}$=	3.75+1$\frac{1}{4}$=	9÷$\frac{3}{7}$=	4762÷78≈
2÷7=	0.6×1.5=	$\frac{7}{8}$×$\frac{3}{5}$÷$\frac{7}{8}$×$\frac{3}{5}$=	1.2-1.2÷4=

Answer 1

分析 根據(jù)小數(shù)和分?jǐn)?shù)加減乘除法運(yùn)算的計(jì)算法則計(jì)算即可求解．注意$\frac{7}{8}$×$\frac{3}{5}$÷$\frac{7}{8}$×$\frac{3}{5}$變形為（$\frac{7}{8}$÷$\frac{7}{8}$）×（$\frac{3}{5}$×$\frac{3}{5}$）計(jì)算，根據(jù)四舍五入法進(jìn)行估算．

解答 解：

9-2$\frac{1}{8}$=6$\frac{7}{8}$	3.75+1$\frac{1}{4}$=5	9÷$\frac{3}{7}$=21	4762÷78≈60
2÷7=$\frac{2}{7}$	0.6×1.5=0.9	$\frac{7}{8}$×$\frac{3}{5}$÷$\frac{7}{8}$×$\frac{3}{5}$=$\frac{9}{25}$	1.2-1.2÷4=0.9

點(diǎn)評 考查了小數(shù)和分?jǐn)?shù)加減乘除法運(yùn)算，關(guān)鍵是熟練掌握計(jì)算法則正確進(jìn)行計(jì)算．