每个算式的积大约是多少?连一连.397×6 6×305 9×488 412×91800 4500 3600 2400.
2106﹣297+599 145+263+55﹣19.
(59+21)×(96÷8)8000÷125÷851.27﹣8.66﹣1.3437×8÷37×8.
计算:1.2×67+6.7×88= .
下面各题,怎样简便就怎样算.450﹣225÷5+135 25×71×499×425 101×79﹣79 304+306÷17﹣298.
简算与计算 3600000÷125÷32÷25 1.25×6.78+25×3.47+125×0.0382 .