÷18= | 125×0.8= | 1÷ + = | 36×( - )= | 2 -0.76+ = |
3.6× = | 50×2.4= | 10÷ = | 10.01×8.99≈ | × ÷ × = |
÷18= , | 125×0.8=100, | 1÷ + =4 , | 36×( - )=10, | 2 -0.76+ =2.24, |
3.6× =3, | 50×2.4=120, | 10÷ =80, | 10.01×8.99≈90, | × ÷ × = . |
分析:根据分数、小数加减乘除的计算方法进行计算;
36×(
-
)根据乘法分配律进行计算;2
-0.76+
根据加法交换律进行计算.点评:口算时,注意运算符号和数据,然后再进一步计算.
÷18=
+
=
=
×
÷
,