| 0.56÷8= | 6.4+ = | 1.2× = | 219+398= | 0.6×0= |
÷0.8= | 4 = | 3 = | × ×5×7= | 2010×0.25×4= |
| 解:0.56÷8=0.07, | 6.4+ =10, | 1.2× =1, | 219+398=617, | 0.6×0=0, |
÷0.8=9, | 4 = , | 3 =2 , | × ×5×7=6, | 2010×0.25×4=2010. |
分析:把219+398看作219+400-2计算;
把3
运用减法的性质,改写成3
-(
+
),从而简算;把
×
×5×7运用乘法交换律和结合律,改写成(
×7)×(
×5),从而简算;把2010×0.25×4运用乘法交换律和结合律,改写成2010×(0.25×4),从而简算;
其它算式按照整数、小数和分数四则运算的方法计算即可.
点评:此题考查看算式直接写得数,要注意积或商中小数点的位置.
=
÷0.8=
=
,