口算.
1
2
×
1
3
=
2
19
×
19
20
=
4
7
×
3
5
+
4
7
×
2
5
=
1
7
9
÷
7
8
=
5
6
÷
2
3
÷
5
6
=
0.375+
5
8
=
3÷
1
3
×3
=
10-
2
9
-
7
9
=
22= 33=
分析:本題根據(jù)分?jǐn)?shù),小數(shù),整數(shù)的加法、減法、乘法與除法的運(yùn)算法則計(jì)算即可;
4
7
×
3
5
+
4
7
×
2
5
利用乘法分配律是計(jì)算簡(jiǎn)便;
10-
2
9
-
7
9
變成10-(
2
9
+
7
9
)計(jì)算簡(jiǎn)便;
22和33注意計(jì)算方法.
解答:解:
1
2
×
1
3
=
1
6
      
2
19
×
19
20
=
1
10
    
4
7
×
3
5
+
4
7
×
2
5
=
4
7
     1
7
9
÷
7
8
=
128
63

5
6
÷
2
3
÷
5
6
=
3
2
       0.375+
5
8
=1        3÷
1
3
×3=27          10-
2
9
-
7
9
=1
22=4               33=27.
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù)的特點(diǎn),快速準(zhǔn)確得出答案.
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