口算.
11
12
-
5
6
=
56×
5
8
=
2
3
÷6
=
0+
5
7
=
4
5
×25
=
3
8
÷
1
8
=
19
15
÷
3
5
=
1
3
-
1
5
=
2
3
×6
=
6
7
×6
=
分析:異分母分?jǐn)?shù)相加減,先通分,變成同分母的分?jǐn)?shù)相加減,再計(jì)算;
分?jǐn)?shù)乘法:分子相乘的積做分子,分母相乘的積做分母,能約分的先約分;
分?jǐn)?shù)除法:除以一個(gè)不為零的數(shù)等于乘上這個(gè)數(shù)的倒數(shù).
解答:解:
11
12
-
5
6
=
1
12
56×
5
8
=35
2
3
÷6
=
1
9
0+
5
7
=
5
7
4
5
×25
=20
3
8
÷
1
8
=3
19
15
÷
3
5
=
19
9
1
3
-
1
5
=
2
15
2
3
×6
=4
6
7
×6
=
36
7
點(diǎn)評:本題屬于基本的計(jì)算,在平時(shí)都積累經(jīng)驗(yàn),逐步提高運(yùn)算的速度和準(zhǔn)確性.
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