A:北宋与辽的争战
B:北宋与金的争战
C:南宋与辽的争战
D:南宋与金的争战
已知:a5=b7=c8,且3a﹣2b+c=9,则2a+4b﹣3c=____
—Sure,I always help my mom look after my little sister.
-- Not bad, we're having a great time. Thank you.