题目内容
(1)
=
(2)15:3=12:x
(3)
:
=x:
(4)
=
.
| 6 |
| x |
| 10 |
| 7 |
(2)15:3=12:x
(3)
| 3 |
| 4 |
| 9 |
| 10 |
| 3 |
| 5 |
(4)
| 1.25 |
| 0.25 |
| x |
| 1.6 |
(1)
| 6 |
| x |
| 10 |
| 7 |
10x=6×7,
10x=42,
10x÷10=42÷10,
x=4.2;
(2)15:3=12:x,
15x=3×12,
15x=36,
15x÷15=36÷15,
x=2.4;
(3)
| 3 |
| 4 |
| 9 |
| 10 |
| 3 |
| 5 |
| 9 |
| 10 |
| 3 |
| 4 |
| 3 |
| 5 |
| 9 |
| 10 |
| 9 |
| 20 |
| 9 |
| 10 |
| 9 |
| 10 |
| 9 |
| 20 |
| 9 |
| 10 |
x=
| 1 |
| 2 |
(4)
| 1.25 |
| 0.25 |
| x |
| 1.6 |
0.25x=1.25×1.6,
0.25x=2,
0.25x÷0.25=2÷0.25,
x=8.
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