问题
解答题
解方程或解比例: 1.6×3-2χ=4 1.5χ+χ=25
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答案
(1)1.6×3-2x=4,
4.8-2x=4,
4.8-2x+2x=4+2x,
4+2x=4.8,
4+2x-4=4.8-4,
2x=0.8,
2x÷2=0.8÷2,
x=0.4;
(2)1.5x+x=25,
2.5x=25,
2.5x÷2.5=25÷2.5,
x=10;
(3)
1 |
2 |
1 |
4 |
1 |
3 |
1 |
2 |
1 |
4 |
1 |
3 |
1 |
2 |
1 |
12 |
1 |
2 |
1 |
2 |
1 |
12 |
1 |
2 |
x=
1 |
6 |