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(1)求比值 60:42 4.8:7.5 38:
(1)求比值60:424.8:7.538:9203.5:825(2)化简比51:6872160.75:3.750.25:14....
(1)求比值 60:42 4.8:7.5 38:920 3.5:825(2)化简比 51:68 7216 0.75:3.75 0.25:14.
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60:42=60÷42=
;
4.8:7.5=(4.8×10)÷(7.5×10)=48÷75═
=
;
:
=
÷
=
;
3.5:8
=
:
=
÷
=
×
=
;
(2)51:68=(51÷17):(68÷17)=3:4;
=(72÷8):(16÷8)=9:2;
0.75:3.75=(0.75×100):(3.75×100)=75:375=1:5;
0.25:
=0.25:0.25=(0.25×100):(0.25×100)=1:1.
10 |
7 |
4.8:7.5=(4.8×10)÷(7.5×10)=48÷75═
48 |
75 |
16 |
25 |
3 |
8 |
9 |
20 |
3 |
8 |
9 |
20 |
5 |
6 |
3.5:8
2 |
5 |
35 |
10 |
42 |
5 |
35 |
10 |
42 |
5 |
35 |
10 |
5 |
42 |
5 |
12 |
(2)51:68=(51÷17):(68÷17)=3:4;
72 |
16 |
0.75:3.75=(0.75×100):(3.75×100)=75:375=1:5;
0.25:
1 |
4 |
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