a+b=420,a÷b=3/7,a=_,b=_.
问题描述:
a+b=420,a÷b=
,a=______,b=______. 3 7
答
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....