1. 直接写出得数。
$\frac{2}{9}×6=$
$\frac{4}{15}÷\frac{8}{35}=$
$\frac{3}{5}×\frac{2}{3}=$
$\frac{8}{9}×\frac{9}{10}=$
$9÷\frac{3}{5}=$
$\frac{7}{12}÷14=$
$\frac{5}{6}÷\frac{5}{3}=$
$9×\frac{6}{7}=$
$\frac{3}{4}×4÷\frac{3}{4}×4=$
$1÷\frac{1}{3}÷\frac{1}{3}×1=$
$\frac{8}{9}÷\frac{2}{7}×0=$
$\frac{2}{9}×6=$
$1\frac{1}{3}$
$\frac{4}{15}÷\frac{8}{35}=$
$1\frac{1}{6}$
$\frac{3}{5}×\frac{2}{3}=$
$\frac{2}{5}$
$\frac{8}{9}×\frac{9}{10}=$
$\frac{4}{5}$
$9÷\frac{3}{5}=$
15
$\frac{7}{12}÷14=$
$\frac{1}{24}$
$\frac{5}{6}÷\frac{5}{3}=$
$\frac{1}{2}$
$9×\frac{6}{7}=$
$7\frac{5}{7}$
$\frac{3}{4}×4÷\frac{3}{4}×4=$
16
$1÷\frac{1}{3}÷\frac{1}{3}×1=$
9
$\frac{8}{9}÷\frac{2}{7}×0=$
0
答案：$1\frac{1}{3}$
$1\frac{1}{6}$
$\frac{2}{5}$
$\frac{4}{5}$
15
$\frac{1}{24}$
$\frac {1}{2}$
$7\frac{5}{7}$
16
9
0
$1\frac{1}{6}$
$\frac{2}{5}$
$\frac{4}{5}$
15
$\frac{1}{24}$
$\frac {1}{2}$
$7\frac{5}{7}$
16
9
0
2. 计算下面各题。
$\frac{3}{5}×4÷\frac{2}{5}$
$\frac{7}{12}÷\frac{14}{15}÷\frac{3}{4}$
$\frac{7}{15}÷\frac{14}{5}×\frac{3}{2}$
$\frac{9}{34}÷\frac{2}{17}÷\frac{9}{8}$
$\frac{3}{5}×4÷\frac{2}{5}$
$\frac{7}{12}÷\frac{14}{15}÷\frac{3}{4}$
$\frac{7}{15}÷\frac{14}{5}×\frac{3}{2}$
$\frac{9}{34}÷\frac{2}{17}÷\frac{9}{8}$
答案：$ =\frac 35×4×\frac 52$
$ =\frac 35×\frac 52×4$
$ =\frac 32×4$
=6
$ =\frac 7{12}×\frac {15}{14}×\frac 43$
$ =\frac 58×\frac 43$
$ =\frac 56$
$ =\frac 7{15}×\frac 5{14}×\frac 32$
$ =\frac 16×\frac 32$
$ =\frac 14$
$ =\frac 9{34}×\frac {17}2×\frac 89$
$ =\frac 94×\frac 89$
=2
$ =\frac 35×\frac 52×4$
$ =\frac 32×4$
=6
$ =\frac 7{12}×\frac {15}{14}×\frac 43$
$ =\frac 58×\frac 43$
$ =\frac 56$
$ =\frac 7{15}×\frac 5{14}×\frac 32$
$ =\frac 16×\frac 32$
$ =\frac 14$
$ =\frac 9{34}×\frac {17}2×\frac 89$
$ =\frac 94×\frac 89$
=2
解析：
$\frac{3}{5}×4÷\frac{2}{5}$
$=\frac{3}{5}×4×\frac{5}{2}$
$=\frac{3}{5}×\frac{5}{2}×4$
$=\frac{3}{2}×4$
$=6$
$\frac{7}{12}÷\frac{14}{15}÷\frac{3}{4}$
$=\frac{7}{12}×\frac{15}{14}×\frac{4}{3}$
$=\frac{5}{8}×\frac{4}{3}$
$=\frac{5}{6}$
$\frac{7}{15}÷\frac{14}{5}×\frac{3}{2}$
$=\frac{7}{15}×\frac{5}{14}×\frac{3}{2}$
$=\frac{1}{6}×\frac{3}{2}$
$=\frac{1}{4}$
$\frac{9}{34}÷\frac{2}{17}÷\frac{9}{8}$
$=\frac{9}{34}×\frac{17}{2}×\frac{8}{9}$
$=\frac{9}{4}×\frac{8}{9}$
$=2$
$=\frac{3}{5}×4×\frac{5}{2}$
$=\frac{3}{5}×\frac{5}{2}×4$
$=\frac{3}{2}×4$
$=6$
$\frac{7}{12}÷\frac{14}{15}÷\frac{3}{4}$
$=\frac{7}{12}×\frac{15}{14}×\frac{4}{3}$
$=\frac{5}{8}×\frac{4}{3}$
$=\frac{5}{6}$
$\frac{7}{15}÷\frac{14}{5}×\frac{3}{2}$
$=\frac{7}{15}×\frac{5}{14}×\frac{3}{2}$
$=\frac{1}{6}×\frac{3}{2}$
$=\frac{1}{4}$
$\frac{9}{34}÷\frac{2}{17}÷\frac{9}{8}$
$=\frac{9}{34}×\frac{17}{2}×\frac{8}{9}$
$=\frac{9}{4}×\frac{8}{9}$
$=2$
3. 解方程。
$0.2x+9.7= 49.7$
$4.5x+x= 11$
$4x÷3.6= 11.8$
$2x-9= 3.2$
$0.2x+9.7= 49.7$
$4.5x+x= 11$
$4x÷3.6= 11.8$
$2x-9= 3.2$
答案： 解：0.2x=49.7-9.7
0.2x=40
x=40÷0.2
x=200
解：5.5x=11
x=11÷5.5
x=2
解：4x=11.8×3.6
x=11.8×3.6÷4
x=10.62
解：2x=3.2+9
2x=12.2
x=12.2÷2
x=6.1
0.2x=40
x=40÷0.2
x=200
解：5.5x=11
x=11÷5.5
x=2
解：4x=11.8×3.6
x=11.8×3.6÷4
x=10.62
解：2x=3.2+9
2x=12.2
x=12.2÷2
x=6.1
解析：
解：0.2x+9.7=49.7
0.2x=49.7-9.7
0.2x=40
x=40÷0.2
x=200
解：4.5x+x=11
5.5x=11
x=11÷5.5
x=2
解：4x÷3.6=11.8
4x=11.8×3.6
4x=42.48
x=42.48÷4
x=10.62
解：2x-9=3.2
2x=3.2+9
2x=12.2
x=12.2÷2
x=6.1
0.2x=49.7-9.7
0.2x=40
x=40÷0.2
x=200
解：4.5x+x=11
5.5x=11
x=11÷5.5
x=2
解：4x÷3.6=11.8
4x=11.8×3.6
4x=42.48
x=42.48÷4
x=10.62
解：2x-9=3.2
2x=3.2+9
2x=12.2
x=12.2÷2
x=6.1