《2025年跳跳熊预习日日清六年级数学下册人教版》

1. 化简比。
0.4:2 =
5:2.5 =
0.3:1.2 =
4:5.2 =
0.4:1 =
3:4.5 =
0.8:1.2 =
75:150 =
2:0.4 =
24:72 =
1.5:5 =
25%:15% =
25:20 =
280:70 =
$\frac{3}{5}:5 =$
$\frac{7}{15}:\frac{3}{5} =$
$5:\frac{1}{5} =$
$\frac{1}{6}:\frac{2}{7} =$
$\frac{5}{2}:\frac{2}{5} =$
$\frac{1}{3}:\frac{2}{9} =$

答案： 1:5 2:1 1:4 10:13
2:5 2:3 2:3 1:2
5:1 1:3 3:10 5:3
5:4 4:1 3:25 7:9
25:1 7:12 25:4 3:2

2. 把等式改写成比例。
①4×15 = 5×12
②3.2×3.75 = 1.5×8
③4a = 9b(a、b≠0)

答案： ①4:5 = 12:15
②3.2:1.5 = 8:3.75
③4:9 = b:a（答案不唯一）

3. 解下列方程。
①1.8÷5.4 = x÷6
②x÷(0.25×8) = 8.4
③x÷2.5 = 18÷4.5
④x÷$\frac{1}{3}$ = $\frac{7}{8}$÷$\frac{4}{3}$
⑤0.6÷x = 1.2÷4
⑥x÷0.5 = 10÷20

答案： ①x = 2 ②x = 16.8 ③x = 10
④x = $\frac{7}{32}$ ⑤x = 2 ⑥x = 0.25