a+b=420,a÷b=3/7,a=_,b=_.

问题描述:

a+b=420,a÷b=

3
7
,a=______,b=______.

由a÷b=37,可得:a=37b;代入a+b=420,可得:   37b+b=420    107b=420107b÷107=420÷107       b=294;a=37b=37×294=126.故答案为:126,294....