①84.3-6.57-3.43

②3.8+2.64+6.2+7.36

③101×85-85

④9000÷125÷8

⑤3000÷[90-（65-50）]

⑥47×18-8×47

62×<600                  70×<500

×18<370                  ×45<400

15×60=           15×=180

150×60=          ×6=180

5×9=            30÷6=            40÷5=            600+300=

12÷2=            7×8=            21÷3=            1200-200=

18÷9=            54÷6=            9×9=            2000+3000=

24÷4=            35÷5=            32÷8=            4500-500=

36÷9=            42÷7=            27÷3=            1300+300=

8÷4=             15÷5=            28÷7=            9000-2000=

45÷9=            14÷2=            9÷3=             3800+2000=

20÷5=            10÷2=            6÷2=            7500-7000=

63÷7=            12÷3             30÷5=            4800+200=

48÷8=            49÷7=            16÷2=            6500-4000=

18÷3=            21÷7=            10÷5=            700+900=

25÷5=            72÷8=            12÷4=            1000-600=

14÷7=            18÷2=            24÷6=            7800+200=

24÷3=            16÷4=            56÷7=            9200-2000=

18÷6=            64÷8=            35÷7=            5300+3000=

8÷2=             32÷4=             54÷9=            4000-1000=

28÷4=            63÷9=            36÷6=            3200+600=

15÷3=            20÷4=            81÷9=            8000-6000=

42÷6=            40÷8=            24÷8=            1500+500=

72÷9=            12÷6=            45÷5=            4700-4000=