直接寫(xiě)出得數(shù)
2
3
+
1
3
=
1
1
1-
8
9
=
1
9
1
9
1
6
-
1
7
=
1
42
1
42
5
8
-0.5=
1
8
1
8
2
1
4
+5.76+7.75=
15.76
15.76
0.5+2
1
2
=
3
3
0+15.73=
15.73
15.73
1
4
+
1
6
=
5
12
5
12
3
20
+0.05=
0.2
0.2
10-(1
7
8
+0.125)=
8
8
分析:按照計(jì)算順序和計(jì)算法則進(jìn)行計(jì)算,分?jǐn)?shù)與小數(shù)相加減,把分?jǐn)?shù)化成小數(shù)或把小數(shù)化成分?jǐn)?shù)后再進(jìn)行計(jì)算.
解答:
解:
2
3
+
1
3
=1
1-
8
9
=
1
9
1
6
-
1
7
=
1
42
5
8
-0.5=
1
8
2
1
4
+5.76+7.75=15.76
0.5+2
1
2
=3
0+15.73=15.73
1
4
+
1
6
=
5
12
3
20
+0.05=0.2
10-(1
7
8
+0.125)=8.
點(diǎn)評(píng):此題考查學(xué)生的計(jì)算能力,計(jì)算時(shí)要細(xì)心,同時(shí)注意個(gè)別題運(yùn)用定律進(jìn)行簡(jiǎn)算.
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