竖式计算，加★题要验算．472+18952×296.3﹣2.5★612÷3．
脱式计算，能简便的简便． 1.72×+73.8×= 4.2﹣1.38+5.8﹣3.62 0.125×0.25×32 2÷﹣÷290.5×99+90.5．
用简便方法计算 511×2002×2003×2003﹣2002×20047.24×+0.6×2.41﹣0.65×60%
直接写得数==
怎样简便就怎样 18 2.42÷+4.58×﹣4÷3．
①② ③0.25×32×0.125④．
+73.8×
= 4.2﹣1.38+5.8﹣3.62 0.125×0.25×32
﹣
÷290.5×99+90.5．
2002×
2003×2003﹣2002×20047.24×
+0.6×2.41﹣0.65×60%
=
=
+4.58×
﹣4÷3
．
②
．
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