a farmer has some pigs and some ducks.there are 9 headsand 26 feet.有猪多少
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a farmer has some pigs and some ducks.there are 9 headsand 26 feet.有猪多少
a farmer has some pigs and some ducks.there are 9 headsand 26 feet.有猪多少
a farmer has some pigs and some ducks.there are 9 headsand 26 feet.有猪多少
四
猪有4只 鸭有5只
设猪为x只,鸭y只
猪和鸭的头一共九个所以
x+y=9
猪四只脚鸭两只脚,一共26只脚,所以
4x+2y=26
解方程组得x=4,y=5
所以猪4只,鸭5只
有四头猪和五只羊...
列2个算式验算..
4×4+2×5=26(脚)
4+5=9(头)
选择A:farmer has some pigs and some ducks.there are 9heads and26feer.A:farmer has some pigs and some ducks.there are 9heads and26feer.How many pigs are there?A.3 B.4 C.5 D.6
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