题目内容
8.连一连.分析 (1)整数比化简方法:把比的前项和后项同时除以它们的最大公因数.
(2)分数比化简方法:把比的前项和后项同时乘它们的分母的最小公倍数,变成整数比,再进行化简;利用求比值的方法也可化简分数比,但结果必须写成比的形式.
(3)小数比化简方法:先把比的前项和后项的小数点同时向右移动相同位数,变成整数比,再进行化简.
根据整数比、分数比、小数比的化简方法,将相同的比连接起来即可.
解答 解:根据分析,可得
(1)36:60
=(36÷12):(60÷12)
=3:5
$\frac{1}{2}:\frac{1}{3}$
=($\frac{1}{2}×6$):($\frac{1}{3}×6$)
=3:2
$\frac{5}{6}:\frac{5}{8}$
=($\frac{5}{6}×24$):($\frac{5}{8}×24$)
=20:15
=(20÷5):(15÷5)
=4:3
0.8:0.12
=80:12
=(80÷4):(12÷4)
=20:3
0.45:1
=45:100
=(45÷5):(100÷5)
=9:20
0.9:$\frac{3}{5}$
=0.9:0.6
=9:6
=(9÷3):(6÷3)
=3:2
2:0.3
=20:3
$\frac{7}{20}:\frac{7}{9}$
=($\frac{7}{20}×180$):($\frac{7}{9}×180$)
=63:140
=(63÷7):(140÷7)
=9:20
$\frac{5}{12}:\frac{15}{48}$
=($\frac{5}{12}×48$):($\frac{15}{48}×48$)
=20:15
=(20÷5):(15÷5)
=4:3
(2)0.6:0.12
=60:12
=5:1
4:8
=(4÷4):(8÷4)
=1:2
$\frac{2}{15}:\frac{4}{9}$
=($\frac{2}{15}×45$):($\frac{4}{9}$×45)
=6:20
=(6÷2):(20÷2)
=3:10
$\frac{1}{6}:\frac{8}{9}$
=($\frac{1}{6}×18$):($\frac{8}{9}×18$)
=3:16
$\frac{3}{4}:0.25$
=0.75:0.25
=75:25
=(75÷25):(25÷25)
=3:1
$\frac{1}{2}:\frac{8}{3}$
=($\frac{1}{2}×6$):($\frac{8}{3}×6$)
=3:16
$\frac{1}{2}:\frac{1}{10}$
=($\frac{1}{2}×10$):($\frac{1}{10}×10$)
=5:1
$\frac{1}{3}:\frac{1}{9}$
=($\frac{1}{3}×9$):($\frac{1}{9}×9$)
=3:1
$\frac{1}{4}:\frac{1}{2}$
=($\frac{1}{4}×4$):($\frac{1}{2}×4$)
=1:2
点评 此题主要考查了求比值和化简比的方法,要熟练掌握整数比、分数比、小数比的化简方法.
A. | 0.1 | B. | 0.9 | C. | 1 |