請(qǐng)觀察并計(jì)算下列各題,你發(fā)現(xiàn)了什么?
1
2
×
1
3
=
1
3
×
1
4
=
1
4
×
1
5
=
1
10
×
1
11
=
1
2
-
1
3
=
1
3
-
1
4
=
1
4
-
1
5
=
1
10
-
1
11
=
分析:依據(jù)分?jǐn)?shù)加減乘除的運(yùn)算方法逐個(gè)進(jìn)行計(jì)算,進(jìn)而得出規(guī)律.
解答:解:
1
2
×
1
3
=
1
6

1
3
×
1
4
=
1
12
,
1
4
×
1
5
=
1
20
,
1
10
×
1
11
=
1
110
,
1
2
-
1
3
=
1
6

1
3
-
1
4
=
1
12
,
1
4
-
1
5
=
1
20
,
1
10
-
1
11
=
1
110
;
發(fā)現(xiàn)規(guī)律:
1
n
×
1
n+1
=
1
n
-
1
n+1
點(diǎn)評(píng):此題主要考查學(xué)生進(jìn)行分?jǐn)?shù)四則運(yùn)算的能力,并依據(jù)計(jì)算情況總結(jié)一些規(guī)律性的東西.
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