Question

9．直接寫出得數(shù)

40×$\frac{5}{8}$=	$\frac{7}{8}$-$\frac{1}{4}$=	$\frac{2}{3}$×$\frac{6}{7}$=	$\frac{2}{5}$÷10=	$\frac{5}{6}$-1÷6=
4.8÷12%=	39+26=	0.32=	3-2.7=	52=
0.54÷0.9=	1-4%=	280÷35=	5.4÷0.27=	$\frac{3}{4}$×$\frac{8}{9}$=
30×10%-0.3=	12×4÷12×4=	2$\frac{2}{5}$+0.6=	383-98=	26.26÷26=
4.57+6.43=	3.14×32=	7.9×11-7.9=	0.1×30%=	2÷1%-2=
3.6÷0.036=	7÷19=	3.7×0.1%=	0.99×9+0.99=	100×0.1%=

Answer 1

分析 根據(jù)小數(shù)、分?jǐn)?shù)、整數(shù)和百分?jǐn)?shù)加減乘除法的計(jì)算方法進(jìn)行計(jì)算．
7.9×11-7.9、0.99×9+0.99根據(jù)乘法分配律進(jìn)行簡算．

解答 解：

40×$\frac{5}{8}$=25	$\frac{7}{8}$-$\frac{1}{4}$=$\frac{5}{8}$	$\frac{2}{3}$×$\frac{6}{7}$=$\frac{4}{7}$	$\frac{2}{5}$÷10=0.04	$\frac{5}{6}$-1÷6=$\frac{2}{3}$
4.8÷12%=40	39+26=65	0.32=0.09	3-2.7=0.3	52=25
0.54÷0.9=0.6	1-4%=0.96	280÷35=8	5.4÷0.27=20	$\frac{3}{4}$×$\frac{8}{9}$=$\frac{2}{3}$
30×10%-0.3=2.7	12×4÷12×4=16	2$\frac{2}{5}$+0.6=3	383-98=285	26.26÷26=1.01
4.57+6.43=11	3.14×32=28.26	7.9×11-7.9=79	0.1×30%=0.03	2÷1%-2=198
3.6÷0.036=100	7÷19=$\frac{7}{19}$	3.7×0.1%=0.0037	0.99×9+0.99=9.9	100×0.1%=0.1

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