Question

17．直接寫(xiě)出得數(shù)．

$\frac{1}{4}$×$\frac{1}{5}$=	7÷$\frac{1}{4}$=	$\frac{2}{3}$-$\frac{1}{5}$=	0.64+3.6=
1÷$\frac{1}{9}$×9=	$\frac{1}{8}$×$\frac{5}{6}$+$\frac{1}{8}$×$\frac{1}{6}$=	$\frac{2}{5}$×$\frac{2}{3}$÷$\frac{2}{5}$×$\frac{2}{3}$=	$\frac{3}{4}$+$\frac{5}{6}$=
101×$\frac{4}{5}$-$\frac{4}{5}$=	6.5-0.72-0.28=

Answer 1

分析 運(yùn)用分?jǐn)?shù)的乘除法的計(jì)算法則進(jìn)行計(jì)算即可，計(jì)算101×$\frac{4}{5}$$-\frac{4}{5}$時(shí)運(yùn)用乘法的分配律進(jìn)行計(jì)算，計(jì)算6.5-0.72-0.28運(yùn)用減法的性質(zhì)進(jìn)行解答即可．

解答

解：$\frac{1}{4}$×$\frac{1}{5}$=$\frac{1}{20}$	7÷$\frac{1}{4}$=28	$\frac{2}{3}$-$\frac{1}{5}$=$\frac{7}{15}$	0.64+3.6=4.24
1÷$\frac{1}{9}$×9=81	$\frac{1}{8}$×$\frac{5}{6}$+$\frac{1}{8}$×$\frac{1}{6}$=$\frac{1}{8}$	$\frac{2}{5}$×$\frac{2}{3}$÷$\frac{2}{5}$×$\frac{2}{3}$=$\frac{4}{9}$	$\frac{3}{4}$+$\frac{5}{6}$=$\frac{19}{12}$
101×$\frac{4}{5}$-$\frac{4}{5}$=80	6.5-0.72-0.28=5.5

點(diǎn)評(píng) 本題考查了分?jǐn)?shù)的加減乘除法的計(jì)算法則，認(rèn)真計(jì)算即可．