Question

13．直接寫(xiě)出得數(shù)：

910-590=	$\frac{1}{3}$÷$\frac{1}{5}$=	0.72÷0.6=	6-6÷7=
$\frac{7}{30}$×$\frac{3}{5}$÷$\frac{7}{30}$×$\frac{2}{5}$=	9.23+2.7=	$\frac{1}{4}$+$\frac{5}{6}$=	4÷$\frac{4}{9}$×9=
0.45×6×0.5=	$\frac{1}{3}$÷$\frac{6}{5}$×$\frac{9}{10}$=

Answer 1

分析 根據(jù)四則運(yùn)算的計(jì)算法則計(jì)算即可求解．注意6-6÷7先算除法再算減法；$\frac{7}{30}$×$\frac{3}{5}$÷$\frac{7}{30}$×$\frac{2}{5}$、$\frac{1}{3}$÷$\frac{6}{5}$×$\frac{9}{10}$把除法變乘法，再運(yùn)用乘法的交換律結(jié)合律簡(jiǎn)算；4÷$\frac{4}{9}$×9由左到右的順序計(jì)算；0.45×6×0.5運(yùn)用乘法的交換律結(jié)合律簡(jiǎn)算．

解答 解：

910-590=320	$\frac{1}{3}$÷$\frac{1}{5}$=$\frac{5}{3}$	0.72÷0.6=1.2	6-6÷7=$\frac{36}{7}$
$\frac{7}{30}$×$\frac{3}{5}$÷$\frac{7}{30}$×$\frac{2}{5}$=$\frac{6}{25}$	9.23+2.7=11.93	$\frac{1}{4}$+$\frac{5}{6}$=$\frac{13}{12}$	4÷$\frac{4}{9}$×9=81
0.45×6×0.5=1.35	$\frac{1}{3}$÷$\frac{6}{5}$×$\frac{9}{10}$=$\frac{1}{4}$

點(diǎn)評(píng) 考查了四則運(yùn)算，關(guān)鍵是熟練掌握計(jì)算法則正確進(jìn)行計(jì)算．