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先化简下面各比,再求比值.2.1:14 0.25:167 23:56 9
1个回答
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(1)2.1:14
=(2.1×10):(14×10)
=21:140
=(21÷7):(140÷7)
=3:20;
3:20=3÷20=
;
(2)0.25:
=
:
=(
×28):(
×28)
=7:64;
7:64=7÷64=
;
(3)
:
=(
×6):(
×6)
=4:5;
4:5=4÷5=
;
(4)
:
=(
×
):(
×
)
=3:4;
3:4=3÷4=
.
=(2.1×10):(14×10)
=21:140
=(21÷7):(140÷7)
=3:20;
3:20=3÷20=
3 |
20 |
(2)0.25:
16 |
7 |
=
1 |
4 |
16 |
7 |
=(
1 |
4 |
16 |
7 |
=7:64;
7:64=7÷64=
7 |
64 |
(3)
2 |
3 |
5 |
6 |
=(
2 |
3 |
5 |
6 |
=4:5;
4:5=4÷5=
4 |
5 |
(4)
9 |
8 |
3 |
2 |
=(
9 |
8 |
8 |
3 |
3 |
2 |
8 |
3 |
=3:4;
3:4=3÷4=
3 |
4 |
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