看誰(shuí)算得又準(zhǔn)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:根據(jù)整數(shù)、小數(shù)、分?jǐn)?shù)四則運(yùn)算的計(jì)算法則,直接進(jìn)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
點(diǎn)評(píng):此題考查的目的是理解掌握整數(shù)、小數(shù)、分?jǐn)?shù)四則運(yùn)算的計(jì)算法則,并且能夠正確熟練地進(jìn)行口算,提高口算能力.
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