题目内容
细心解比例.
:x=3:16
=0.7:5
12.5%:0.2=150:x
=
.
| 5 |
| 8 |
| 42 |
| x |
12.5%:0.2=150:x
| o.3x |
| 5 |
| 21 |
| 8 |
(1)
:x=3:16,
3x=
×16,
3x÷3=10÷3,
x=3
;
(2)
=0.7:5,
0.7x=42×5,
0.7x÷0.7=210÷0.7,
x=300;
(3)12.5%:0.2=150:x,
12.5%x=0.2×150,
0.125x÷0.125=30÷0.125,
x=240;
(4)
=
,
0.3x×8=21×5,
2.4x=105,
2.4x÷2.4=105÷2.4,
x=43.75.
| 5 |
| 8 |
3x=
| 5 |
| 8 |
3x÷3=10÷3,
x=3
| 1 |
| 3 |
(2)
| 42 |
| x |
0.7x=42×5,
0.7x÷0.7=210÷0.7,
x=300;
(3)12.5%:0.2=150:x,
12.5%x=0.2×150,
0.125x÷0.125=30÷0.125,
x=240;
(4)
| o.3x |
| 5 |
| 21 |
| 8 |
0.3x×8=21×5,
2.4x=105,
2.4x÷2.4=105÷2.4,
x=43.75.
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