用竖式计算．42.3+15.9= 10﹣3.8= 15×68= 524÷4=
计算下面各题，怎样简便就怎样算．×0.25+0.375×4.97+6.38+5.03﹣4.38 5.84×1.36+13.6×0.316+1.36﹣÷×0.5．
下面各题怎样简便就怎样算． 3.7×99+3.7+﹣5.37﹣1.47﹣2.53 105×（+）13+45÷9×+×．
9999×7778+3333×6666．
下列各题怎样简便就怎样算 （1）7.8×36+78×6.4（2）74×14+111×24．
简便计算 84÷63×3 2.1×5.3+2.1×6.2﹣2.1×1.5．
×0.25+0.375×
4.97+6.38+5.03﹣4.38
﹣
÷
×0.5．×0.25+0.375×4.97+6.38+5.03﹣4.38﹣÷×0.5．
+
﹣
5.37﹣1.47﹣2.53
+
）13+45÷9
×
+
×
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