题目内容

看谁算得又准又快．
4
5
×
1
4
=
3
7
×
7
10
=		 0.9-
9
10
=		 10-
3
4
-
1
4
=
2
3
×12=		 14×
3
7
=
1
2
+
1
4
=
2
3
×
5
8
=
4
7
+
4
7
=		 1-
8
9
=
1
9
1
2
+
1
5
+
1
2
=		 3.6×0.2=
360÷45= 80÷16= 55÷0.001= 55×0.001=
2400÷30= 1.3-0.7= 0.49+0.16= 2.6×0.4=
分析：根据整数、小数、分数四则运算的计算法则，直接进行口算即可．
解答：解：
4
5
×
1
4
=
1
5
3
7
×
7
10
=
3
10
 0.9-
9
10
=0		 10-
3
4
-
1
4
=9
2
3
×12=8		 14×
3
7
=6
1
2
+
1
4
=
3
4
2
3
×
5
8
=
5
12
4
7
+
4
7
=1
1
7
 1-
8
9
=
1
9
1
2
+
1
5
+
1
2
=1
1
5
 3.6×0.2=0.72
360÷45=8 80÷16=5 55÷0.001=55000 55×0.001=0.055
2400÷30=80 1.3-0.7=0.6 0.49+0.16=0.65 2.6×0.4=1.04
点评：此题考查的目的是理解掌握整数、小数、分数四则运算的计算法则，并且能够正确熟练地进行口算，提高口算能力．
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1
3
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6
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21
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9
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16
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4
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2
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1
2
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13.2
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21
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