问题
解答题
解方程或比例. ①
②
③2.5x-1.9×3=6.2. |
答案
(1)
x |
6 |
2.5 |
3 |
3x=6×2.5,
3x÷3=15÷3,
x=5;
(2)
1 |
4 |
5x=
1 |
4 |
5x=0.1,
5x÷5=0.1÷5,
x=0.02;
(3)2.5x-1.9×3=6.2,
2.5x-5.7=6.2,
2.5x-5.7+5.7=6.2+5.7,
2.5x÷2.5=11.9÷2.5,
x=4.76.
解方程或比例. ①
②
③2.5x-1.9×3=6.2. |
(1)
x |
6 |
2.5 |
3 |
3x=6×2.5,
3x÷3=15÷3,
x=5;
(2)
1 |
4 |
5x=
1 |
4 |
5x=0.1,
5x÷5=0.1÷5,
x=0.02;
(3)2.5x-1.9×3=6.2,
2.5x-5.7=6.2,
2.5x-5.7+5.7=6.2+5.7,
2.5x÷2.5=11.9÷2.5,
x=4.76.