Question

已知a乘以3/5等于b除以1/3等于c乘以1/4等于d除以8/7,A不等于0,把ABCD从大到小排列

Answer 1

a/(1/4)=b/(1/3)=c*(1/5)

4a=3b=c/5

20a=15b=c

because a,b,c>0

1) c/a=20>1, so c>a

2) a/b=15/20b

so, c>b>a