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一、化简下面各比。
$19:57= ($
$\frac {3}{4}:\frac {4}{5}= ($
$1:\frac {5}{7}= ($
$5.5:5= ($
$0.3:0.18= ($
$\frac {2}{9}:\frac {1}{3}= ($
$\frac {3}{20}:\frac {5}{8}= ($
$30:18= ($
$\frac {3}{10}:\frac {7}{15}= ($
$0.3:1.8= ($
$19:57= ($
1
$):($3
$)$ $4:\frac {2}{5}= ($10
$):($1
$)$$\frac {3}{4}:\frac {4}{5}= ($
15
$):($16
$)$ $0.125:1= ($1
$):($8
$)$$1:\frac {5}{7}= ($
7
$):($5
$)$ $12:48= ($1
$):($4
$)$$5.5:5= ($
11
$):($10
$)$ $\frac {3}{20}:\frac {3}{8}= ($2
$):($5
$)$$0.3:0.18= ($
5
$):($3
$)$ $0.21:1.5= ($7
$):($50
$)$$\frac {2}{9}:\frac {1}{3}= ($
2
$):($3
$)$ $0.5:2.5= ($1
$):($5
$)$$\frac {3}{20}:\frac {5}{8}= ($
6
$):($25
$)$ $16:\frac {3}{4}= ($64
$):($3
$)$$30:18= ($
5
$):($3
$)$ $0.54:1.6= ($27
$):($80
$)$$\frac {3}{10}:\frac {7}{15}= ($
9
$):($14
$)$ $0.25:\frac {1}{4}= ($1
$):($1
$)$$0.3:1.8= ($
1
$):($6
$)$ $12:\frac {2}{5}= ($30
$):($1
$)$答案
一、1:3 10:1 15:16 1:8 7:5 1:4 11:10 2:5 5:3 7:50 2:3 1:5 6:25 64:3 5:3 27:80 9:14 1:1 1:6 30:1
二、在括号里填合适的数。
$4:9= 12:$
$25:5=$
$\frac {2}{3}=$
$3:2= 6÷$
$4:9= 12:$
27
$18:24=$3
$:4$$25:5=$
5
$:1$ 12
$:36= 16:48$3
$:15= 15:$75
$40:$10
$=$160
$:40$$\frac {2}{3}=$
2
$÷$3
$=$2
$:$3
$3:2= 6÷$
4
$= \frac {}$36
$/24=$120
$:80=$1.5
(填小数)答案
二、27 3 5 12 3 75 10 160 2 3 2 3 4 36 120 1.5 （部分答案不唯一）
解析
27；3；5；12；3；75（答案不唯一）；10；160（答案不唯一）；2；3；2；3；4；36；120；1.5
