2
3
×
5
6
×
9
10
(
1
2
+
3
4
)×12
4
7
×
3
8
-
1
7
4
11
×7+
4
11
×4
3
5
×
6
7
×
20
27
(
7
12
-
1
4
3
7
分析:(1)(5)按照從左到右順序計(jì)算,
(2)(4)運(yùn)用乘法分配律解答,
(3)按照先算乘法,再算減法順序解答,
(6)按照先算括號(hào)里面的減法,再算括號(hào)外面的乘法順序解答.
解答:解:(1)
2
3
×
5
6
×
9
10

=
5
9
×
9
10

=
1
2


(2)(
1
2
+
3
4
)×12
=
1
2
×12+
3
4
×12
=6+9
=15;

(3)
4
7
×
3
8
-
1
7

=
3
14
-
1
7

=
1
14
;

(4)
4
11
×
7+
4
11
×
4
=
4
11
×
(7+4)
=
4
11
×
11
=4;

(5)
3
5
×
6
7
×
20
27

=
18
35
×
20
27

=
8
21


(6)(
7
12
-
1
4
)×
3
7

=
1
3
×
3
7

=
1
7
點(diǎn)評(píng):(1)依據(jù)四則運(yùn)算計(jì)算方法正確進(jìn)行計(jì)算,(2)運(yùn)用簡(jiǎn)便方法解決問題,是本題考查知識(shí)點(diǎn).
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