①72×49≈
②71×52≈
③89×29≈
④0×11≈
⑤99×22≈
①45×10﹣126
②71+26×4
③75÷(40﹣35)
④(476+136)÷9
10﹣6.8= ﹣ = 35×1%= 1.25×24= 5× ÷5× =
0.42= 10÷0.02= 5a×7a= 1÷3= 1﹣1÷6=