化简比和求比值.4:16 5.6:4.2 75:15
化简比和求比值.4:165.6:4.275:1537:92112.5%:0.532:37.5%...
化简比和求比值.4:16 5.6:4.2 75:15 37:921 12.5%:0.5 32:37.5%
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(1)4:16,
=(4÷4):(16÷4),
=1:4;
4:16=1:4=1÷4=
.
(2)5.6:4.2,
=(5.6×10÷14):(4.2×10÷14),
=4:3;
5.6:4.2=4:3=4÷3=
.
(3)75:15,
=(75÷15):(15÷15),
=5:1;
75:15=5:1=5÷1=5.
(4)
:
,
=(
×21):(
×21),
=9:9,
=1:1;
:
=1:1=1÷1=1.
(5)12.5%:0.5,
=(0.125×8):(0.5×8),
=1:4;
12.5%:0.5=1:4=1÷4=
.
(6)
:37.5%,
=(
×8):(
×8),
=12:3,
=4:1;
:37.5%=4:1=4÷1=4.
=(4÷4):(16÷4),
=1:4;
4:16=1:4=1÷4=
1 |
4 |
(2)5.6:4.2,
=(5.6×10÷14):(4.2×10÷14),
=4:3;
5.6:4.2=4:3=4÷3=
4 |
3 |
(3)75:15,
=(75÷15):(15÷15),
=5:1;
75:15=5:1=5÷1=5.
(4)
3 |
7 |
9 |
21 |
=(
3 |
7 |
9 |
21 |
=9:9,
=1:1;
3 |
7 |
9 |
21 |
(5)12.5%:0.5,
=(0.125×8):(0.5×8),
=1:4;
12.5%:0.5=1:4=1÷4=
1 |
4 |
(6)
3 |
2 |
=(
3 |
2 |
3 |
8 |
=12:3,
=4:1;
3 |
2 |
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