Question

11．口算

0.56÷8=	6.4+3$\frac{3}{5}$=	1.2×$\frac{5}{6}$=	219+398=
0.6×0=	7$\frac{1}{5}$÷0.8=	4$\frac{2}{3}$-4$\frac{5}{12}$=	3$\frac{1}{5}$-$\frac{1}{6}$-$\frac{5}{6}$=
$\frac{3}{7}$×$\frac{2}{5}$×5×7=	2013×0.25×4=

Answer 1

分析 根據(jù)分?jǐn)?shù)和小數(shù)加減乘除法的計(jì)算方法進(jìn)行計(jì)算．
3$\frac{1}{5}$-$\frac{1}{6}$-$\frac{5}{6}$根據(jù)減法的性質(zhì)進(jìn)行簡算；
$\frac{3}{7}$×$\frac{2}{5}$×5×7根據(jù)乘法交換律和結(jié)合律進(jìn)行簡算；
2013×0.25×4根據(jù)乘法結(jié)合律進(jìn)行簡算．

解答 解：

0.56÷8=0.07	6.4+3$\frac{3}{5}$=10	1.2×$\frac{5}{6}$=1	219+398=617
0.6×0=0	7$\frac{1}{5}$÷0.8=9	4$\frac{2}{3}$-4$\frac{5}{12}$=$\frac{1}{4}$	3$\frac{1}{5}$-$\frac{1}{6}$-$\frac{5}{6}$=2$\frac{1}{5}$
$\frac{3}{7}$×$\frac{2}{5}$×5×7=6	2013×0.25×4=2013

點(diǎn)評 口算時，注意運(yùn)算符號和數(shù)據(jù)，然后再進(jìn)一步計(jì)算．