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大容器10L 中容器7L 小容器3L
10 0 0
3 7 0
3 4 3
6 4 0
6 1 3
9 1 0
9 0 1
2 7 1
2 5 3
5 5 0
1. 是说两个数的和是-42,第一个减第二个是52,求这两个数
假设第一个是x,则第二个是x-52,x+x-52=-42,所以x=5
第一个数是5,第二个是-47
英文版:Suppose the first number is x, then the second number is x-52
x+x-52=42
x=5
So, the first number is 5 and the second number is -47
3. 两个数的差是16,大数的3倍等于小数的9倍,球这两个数
假设大数是x,则小数为x-16,3x=9(x-16),求出x=24,所以大数是24,小数是8
Suppose the larger number is x, then the smaller number is x-16
3x=9(x-16)
x=24, then x-16=8
So, the larger number is 24, and the smaller number is 8
5. 豆粕含有16%的蛋白质,玉米粉有9%的蛋白质,每个各需多少磅才能混合得到含有12%蛋白质的350磅混合物?
假设豆粕需要x磅,则玉米粉为350-x磅,16%x+9%(350-x)=12%乘350,得x=150
Suppose soybean meal is x pound, then corn meal is 350-x pound
16%x+9%(350-x)=12%乘350
x=150,350-x=200
So, soybean meal needs 150-lb, and corn meal needs 200-lb
7. 一种含有15%橙汁的饮料,另一种含有5%橙汁,问这两种各需多少升才能混合得到含有10%橙汁的10L饮料?
假设第一种有x升,则第二种有10-x升,15%x+5%(10-x)=10%乘10,x=5
Suppose the former one is x liters, then the later one is 10-x liters
15%x+5%(10-x)=10%乘10
x=5, and 10-x=5
So, the former one needs 5L, and the later one also needs 5L
都是按老外喜欢的方程模式解的
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