计算下面各题,怎样简便就怎样计算 720-720÷15 85×101-85 355+260+140+245 4000÷25 367-144÷24×13 16×15×125 645-180-245 175×56+25×56 204×(38+405÷27)
(1)720-720÷15, =720-48, =672; (2)85×101-85, =85×(101-1), =85×100, =8500; (3)355+260+140+245, =(355+245)+(260+140), =600+400, =1000; (4)4000÷25, =4000÷5÷5, =800÷5, =160; (5)367-144÷24×13, =367-6×13, =367-78, =289; (6)16×15×125, =2×8×15×125, =(2×15)×(125×8), =30×1000, =30000; (7)645-180-245, =645-245-180, =400-180, =220; (8)175×56+25×56, =(175+25)×56, =200×56, =11200; (9)204×(38+405÷27), =204×(38+15), =204×53, =10812. |