题目内容

(2012?成都)
直接写出得数.
2
3
-
1
9
=
34+18= 52-4=
1
3
=
0.6×100= 13-9= 7.31+0.7=
5
8
×48=
10-3.9= 0.52=
3
26
×
13
48
=
26×5=
2-
1
4
=
5÷2%=
4
17
÷
1
4
=
3
4
=
7.5+4.5=
3
5
-
1
2
=
4÷0.2= 0.375÷3=
20÷8=
分析:根据分数、小数和整数加减乘除的计算方法进行计算.
解答:解:
2
3
-
1
9
=
5
9
34+18=52, 52-4=48,
1
3
=0,
0.6×100=60, 13-9=4, 7.31+0.7=8.01,
5
8
×48=30,
10-3.9=6.1, 0.52=0.25,
3
26
×
13
48
=
1
32
26×5=130,
2-
1
4
=1
3
4
5÷2%=250,
4
17
÷
1
4
=
16
17
3
4
=8,
7.5+4.5=12,
3
5
-
1
2
=
1
10
4÷0.2=20, 0.375÷3=0.125,
20÷8=2.5.
点评:口算时,注意运算符号和数据,然后再进一步计算.
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