1÷ = | + = | ÷ = | ÷3= | × = |
- = | ÷7= | ÷ = | 4× = | ÷8= |
× = | ÷ = | ÷0.5= | 5× = | - = |
×0= | 0.3× = | ÷ = | ÷4= | +0.5= |
1÷ =50, | + =1, | ÷ = , | ÷3= , | × = , |
- = , | ÷7= , | ÷ = , | 4× = , | ÷8= , |
× = , | ÷ = , | ÷0.5=1, | 5× = , | - = , |
×0=0, | 0.3× =0.25, | ÷ = , | ÷4= , | +0.5=0.75. |
分析:根据分数和小数加减乘除的计算方法进行计算即可.
点评:口算时,注意运算符号和数据,然后再进一步计算即可.
=
+
=
÷
=
-
=
÷7=
÷
=
=
÷8=
×
=
÷0.5=
=
=
×0=
=
=
÷4=
,
,
,
,
,
,
,
,
,
,