国际长途电话的收费标准为每分钟3元7角,爸爸打国际长途电话用了29分钟,应付多少钱?/J9l1`8B+t/X;R
算式:提示1j,e4L,y5_6J1A6d)O0V/J9l1`8B+t/X;R
答:应付3_4l+B*\3};k。/J9l1`8B+t/X;R