19.99*37+19.99*82-199.9*1.9 = 19.99*37+19.99*82-19.99*10*1.9
=19.99*37+19.99*82-19.99*19 = 19.99*(37+82-19)=19.99*100=1999
888*875*1/7=888*(875*1/7) = 888 * 125 = (111*8)*125=111*(8*125)=111*1000=111000
计算19.99*37+19.99*82-199.9*1.9 888*875*1/7
19.99*37+19.99*82-199.9*1.9 = 19.99*37+19.99*82-19.99*10*1.9
=19.99*37+19.99*82-19.99*19 = 19.99*(37+82-19)=19.99*100=1999
888*875*1/7=888*(875*1/7) = 888 * 125 = (111*8)*125=111*(8*125)=111*1000=111000