Question

7．口算

$\frac{1}{3}$-$\frac{1}{4}$=	$\frac{1}{4}$+1$\frac{2}{3}$=	$\frac{6}{7}$×91=	$\frac{3}{8}$+0.625-1=
1-1÷5=	$\frac{5}{6}$÷5=	22÷2$\frac{4}{9}$=	0.75+2.5=
$\frac{7}{8}$÷$\frac{3}{4}$+7=	$\frac{1}{6}$×$\frac{1}{6}$÷$\frac{1}{6}$×$\frac{1}{6}$=

Answer 1

分析 根据分数的加、减、乘除运算顺序计算即可．

解答 解：

$\frac{1}{3}$-$\frac{1}{4}$=$\frac{1}{12}$	$\frac{1}{4}$+1$\frac{2}{3}$=1$\frac{11}{12}$	$\frac{6}{7}$×91=78	$\frac{3}{8}$+0.625-1=0
1-1÷5=$\frac{4}{5}$	$\frac{5}{6}$÷5=$\frac{1}{6}$	22÷2$\frac{4}{9}$=9	0.75+2.5=3.25
$\frac{7}{8}$÷$\frac{3}{4}$+7=8$\frac{1}{6}$	$\frac{1}{6}$×$\frac{1}{6}$÷$\frac{1}{6}$×$\frac{1}{6}$=$\frac{1}{36}$

点评 本题考查了分数的加、减、乘除运算，熟练掌握运算顺序是解题的关键．