设鸡有x只,则兔有7-x只.
2x+4（7-x）=20
2x+28-4x=20
2x+28=4x+20
2x+20=28
2x=8
x=4
7-4=3（只）
答：鸡有4只,兔有三只.
一个笼子里有鸡和兔若干只,有7个头,20支脚,有多少只鸡和兔?简易方程解答 \\ \\_ .---(') o( )_-\_
一个笼子里有鸡和兔若干只,有7个头,20支脚,有多少只鸡和兔?简易方程解答 \\ \\_ .---(') o( )_-\_
数学人气：552 ℃时间：2020-04-03 15:29:32
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