直接寫出復(fù)數(shù).
2
5
×20
=
16×
3
8
=
3
4
×
2
3
=
8
19
×0
=
5
6
÷10
=
1
5
=
5
7
÷
5
7
=
3
4
×
3
4
=
2
3
+
1
6
=
3
7
+
1
3
=
3
5
-
1
6
=
3
5
-
1
2
=
分析:
8
19
×0
根據(jù)任何數(shù)乘0都得0計(jì)算;分?jǐn)?shù)除法的題目,根據(jù)除以一個(gè)數(shù)等于乘這個(gè)數(shù)的倒數(shù)來計(jì)算;異分母分?jǐn)?shù)相加減先通分,然后再相加減.
解答:解:
2
5
×20
=8,
16×
3
8
=6,
3
4
×
2
3
=
1
2
8
19
×0
=0,
5
6
÷10
=
1
12
,
1
5
=20,
5
7
÷
5
7
=1,
3
4
×
3
4
=
9
16
2
3
+
1
6
=
5
6
3
7
+
1
3
=
16
21
,
3
5
-
1
6
=
13
30
,
3
5
-
1
2
=
1
10
故答案為:8,6,
1
2
,0,
1
12
,20,1,
9
16
,
5
6
16
21
,
13
30
1
10
點(diǎn)評(píng):本題考查了基本的計(jì)算,計(jì)算時(shí)要細(xì)心,注意把結(jié)果化成最簡(jiǎn)分?jǐn)?shù).
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直接寫出復(fù)數(shù).
736+198= 465-199=
5
6
×
8
15
=
11-1.1=
3
4
-
2
5
=
1
4
÷
1
5
=
10.2+8%= 1÷0.5%= 8.9×11-8.9= 0.1×10÷0.1×10= 597×8≈ 6287÷7≈

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