问题
解答题
解方程或比例. ①χ÷
②
③15:7=χ:1.4. |
答案
①x÷
3 |
4 |
x÷
3 |
4 |
3 |
4 |
3 |
4 |
x=27;
②
1 |
8 |
7 |
8 |
31 |
32 |
1 |
8 |
7 |
8 |
7 |
8 |
31 |
32 |
7 |
8 |
1 |
8 |
1 |
8 |
3 |
32 |
1 |
8 |
x=
3 |
4 |
③15:7=x:1.4,
7x=1.4×15,
7x÷7=21÷7,
x=3.
解方程或比例. ①χ÷
②
③15:7=χ:1.4. |
①x÷
3 |
4 |
x÷
3 |
4 |
3 |
4 |
3 |
4 |
x=27;
②
1 |
8 |
7 |
8 |
31 |
32 |
1 |
8 |
7 |
8 |
7 |
8 |
31 |
32 |
7 |
8 |
1 |
8 |
1 |
8 |
3 |
32 |
1 |
8 |
x=
3 |
4 |
③15:7=x:1.4,
7x=1.4×15,
7x÷7=21÷7,
x=3.