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A farmer has some pigs and some ducks.There are 9 heads and 26 feet.how many pigs are there?

分类: 作业答案 • 2022-01-09 18:04:03

问题描述：

A farmer has some pigs and some ducks.There are 9 heads and 26 feet.how many pigs are there?

答

猪x 鸭y
x+y=9
4x+2y=26
x=4
y=5