8
7
-
4
5
)×
7
8
1
2
×
3
5
+
2
5
×
1
2
1
3
×
1
4
)×12
3
7
×15-
3
7
1
4
+
1
6
)×12
10
21
×
2
5
-
2
5
×
3
7
分析:(1)(2)(4)(5)(6)運(yùn)用乘法分配律簡(jiǎn)算;
(3)先算括號(hào)內(nèi)的,再算括號(hào)外的.
解答:解:(1)(
8
7
-
4
5
)×
7
8
,
=
8
7
×
7
8
-
4
5
×
7
8

=1-
7
10
,
=
3
10
;

(2)
1
2
×
3
5
+
2
5
×
1
2
,
=
1
2
×(
3
5
+
2
5
),
=
1
2
×1,
=
1
2
;

(3)(
1
3
×
1
4
)×12,
=
1
12
×12,
=1;

(4)
3
7
×15-
3
7

=
3
7
×(15-1),
=
3
7
×14,
=6;

(5)(
1
4
+
1
6
)×12
=
1
4
×12+
1
6
×12,
=3+2,
=5;

(6)
10
21
×
2
5
-
2
5
×
3
7

=(
10
21
-
3
7
)×
2
5
,
=
1
21
×
2
5

=
2
105
點(diǎn)評(píng):完成本題,要注意分析式中數(shù)據(jù),運(yùn)用合適的簡(jiǎn)便方法計(jì)算.
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