口算.
1
3
×(15+
6
7
)=
48×(
1
4
-
1
6
)=
32.6÷100=
1
5
-
1
5
÷5=
1
5
-
1
6
)×30=
9.1÷0.07=
2
5
×
3
5
×2=
1-0.5%=
分析:本題直接根據(jù)運算法則進(jìn)行計算.
解答:解:
1
3
×(15+
6
7
)=5
2
14
          48×(
1
4
-
1
6
)=4                 32.6÷100=0.326                 
1
5
-
1
5
÷5=
4
25

1
5
-
1
6
)×30=1                 9.1÷0.07=130                  
2
5
×
3
5
×2=
12
25
                   1-0.5%=99.5%
點評:本題可根據(jù)運算法則直接運算,有的題目可以應(yīng)用乘法分配律進(jìn)行簡算,注意看清運算順序和運算符號.
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