①
| ②3:8=24:x | ③
| ④
| ||||||||||||||
⑤x-
| ⑥0.25+25%x=1.5; | ⑦
| ⑧4.5x-
|
| 6 |
| x |
| 10 |
| 7 |
10x=6×7,
10x÷10=42÷10,
x=4.2;
②3:8=24:x,
3x=8×24,
3x÷3=192÷3,
x=64;
③
| 3 |
| 4 |
| 9 |
| 10 |
| 3 |
| 5 |
| 9 |
| 10 |
| 3 |
| 4 |
| 3 |
| 5 |
| 9 |
| 10 |
| 9 |
| 10 |
| 9 |
| 20 |
| 9 |
| 10 |
x=0.5;
④
| 12.5 |
| 2.5 |
| x |
| 8 |
2.5x=12.5×8,
2.5x÷2.5=100÷2.5,
x=40;
⑤x-
| 3 |
| 5 |
| 6 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
| 6 |
| 5 |
| 2 |
| 5 |
x=3;
⑥0.25+25%x=1.5,
0.25+25%x-0.25=1.5-0.25,
25%x÷25%=1.25÷25%,
x=5;
⑦
| 1 |
| 2 |
| 4 |
| 5 |
| 1 |
| 5 |
| 1 |
| 2 |
| 4 |
| 5 |
| 4 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
x=2;
⑧4.5x-
| 1 |
| 2 |
4x÷4=6÷4,
x=1.5.