Question

3．直接寫出得數(shù)

$\frac{2}{9}+\frac{3}{9}$=	$\frac{8}{12}-\frac{5}{12}$=	$1-\frac{5}{6}$=	$\frac{1}{2}+\frac{1}{3}$=
$\frac{7}{8}-\frac{2}{8}$=	$4+\frac{6}{7}$=	$\frac{4}{5}+\frac{1}{5}$=	$\frac{3}{8}-\frac{1}{4}$=
$\frac{9}{10}-\frac{1}{2}$=	$\frac{2}{3}+\frac{1}{4}$=

Answer 1

分析 根據(jù)分數(shù)加減法運算的計算法則進行計算即可，結(jié)果化為最簡分數(shù)．

解答 解：

$\frac{2}{9}+\frac{3}{9}$=$\frac{5}{9}$	$\frac{8}{12}-\frac{5}{12}$=$\frac{1}{4}$	$1-\frac{5}{6}$=$\frac{1}{6}$	$\frac{1}{2}+\frac{1}{3}$=$\frac{5}{6}$
$\frac{7}{8}-\frac{2}{8}$=$\frac{5}{8}$	$4+\frac{6}{7}$=4$\frac{6}{7}$	$\frac{4}{5}+\frac{1}{5}$=1	$\frac{3}{8}-\frac{1}{4}$=$\frac{1}{8}$
$\frac{9}{10}-\frac{1}{2}$=$\frac{2}{5}$	$\frac{2}{3}+\frac{1}{4}$=$\frac{11}{12}$

點評 此題考查了分數(shù)加減法運算的計算法則的運用．