Question

6．直接寫(xiě)出得數(shù)

$\frac{1}{2}$+$\frac{1}{3}$=	$\frac{5}{6}$×$\frac{1}{3}$=	$\frac{5}{12}$×6=
2.5×1.2=	$\frac{2}{5}$÷$\frac{3}{4}$=	8-$\frac{2}{3}$=
4.4-3.4=	27.7-3.2-2.8=	9.9+2.5+0.1=

Answer 1

分析 根據(jù)小數(shù)和分?jǐn)?shù)四則運(yùn)算的計(jì)算法則進(jìn)行計(jì)算即可，27.7-3.2-2.8運(yùn)用減法的性質(zhì)簡(jiǎn)算，9.9+2.5+0.1運(yùn)用加法交換律簡(jiǎn)算．

解答 解：

$\frac{1}{2}$+$\frac{1}{3}$=$\frac{5}{6}$	$\frac{5}{6}$×$\frac{1}{3}$=$\frac{5}{18}$	$\frac{5}{12}$×6=2.5
2.5×1.2=3	$\frac{2}{5}$÷$\frac{3}{4}$=$\frac{8}{15}$	8-$\frac{2}{3}$=7$\frac{1}{3}$
4.4-3.4=1	27.7-3.2-2.8=21.7	9.9+2.5+0.1=12.5

點(diǎn)評(píng) 此題考查了小數(shù)和分?jǐn)?shù)四則運(yùn)算的計(jì)算法則的運(yùn)用．