已知﹙a＋2﹚÷3＝﹙c＋5﹚÷6＝b÷4,且2a＋b＋3c＝21,求a,b,c的值
人气：484 ℃ 时间：2020-03-31 20:09:04
解答
设a+2/3=c+5/6=b/4=k
那么
a=3k-2
b=4k
c=6k-5
2a-b+3c
=2（3k-2）-4k+3（6k-5）
=20k-19
=21
所以k=2
a=4 b=8 c=7
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