Question

19．直接寫出得數(shù)．

$\frac{1}{2}$+0.5=	$\frac{1}{3}$+$\frac{1}{4}$=	$\frac{4}{9}$+$\frac{5}{9}$=
2.5×$\frac{2}{5}$=	$\frac{2}{3}$-$\frac{1}{2}$=	$\frac{2}{5}$-$\frac{1}{10}$=
1-$\frac{5}{8}$=	$\frac{1}{2}$+0.25=	$\frac{9}{44}$×11=
$\frac{16}{51}$×34=	$\frac{18}{21}$×$\frac{7}{9}$=	$\frac{23}{24}$×$\frac{8}{69}$=
$\frac{15}{16}$×$\frac{20}{21}$×$\frac{1}{5}$=	$\frac{9}{10}$×$\frac{2}{3}$×$\frac{5}{6}$=	$\frac{5}{33}$×22×$\frac{1}{2}$=

Answer 1

分析 根據(jù)分數(shù)、小數(shù)四則運算的計算法則進行計算即可．

解答 解：

$\frac{1}{2}$+0.5=1	$\frac{1}{3}$+$\frac{1}{4}$=$\frac{7}{12}$	$\frac{4}{9}$+$\frac{5}{9}$=1
2.5×$\frac{2}{5}$=1	$\frac{2}{3}$-$\frac{1}{2}$=$\frac{1}{6}$	$\frac{2}{5}$-$\frac{1}{10}$=$\frac{3}{10}$
1-$\frac{5}{8}$=$\frac{3}{8}$	$\frac{1}{2}$+0.25=0.75	$\frac{9}{44}$×11=$\frac{9}{4}$
$\frac{16}{51}$×34=$\frac{32}{3}$	$\frac{18}{21}$×$\frac{7}{9}$=$\frac{2}{3}$	$\frac{23}{24}$×$\frac{8}{69}$=$\frac{1}{9}$
$\frac{15}{16}$×$\frac{20}{21}$×$\frac{1}{5}$=$\frac{5}{28}$	$\frac{9}{10}$×$\frac{2}{3}$×$\frac{5}{6}$=$\frac{1}{2}$	$\frac{5}{33}$×22×$\frac{1}{2}$=$\frac{5}{3}$

點評 此題考查了分數(shù)、小數(shù)四則運算的計算法則的運用．