× = | 3600÷30= | 37×1%= | 0.32= | 2× ÷2× = |
÷25%= | 5- = | 0.9+0.4= | + = | 1 - - = |
解: =0.5, | 3600÷30=120, | 37×1%=0.37, | 0.32=0.09, | 2× ÷2× = , |
÷25%=3, | 5- =4 , | 0.9+0.4=1.3, | + = , | 1 - - = , |
分析:根据小数加法和除法、百分数的除法、小数的乘方、分数的乘法以及整数估算的计算方法进行计算即可.
点评:口算时,注意运算符号和小数点的位置,选择合适的方法进行计算.
×
=
÷2×
÷25%=
=
+
=
-
=
=0.5,
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,
,