4
7
×[15×(
1
3
-
3
10
)+
7
8
]
=
 18÷
6
7
-(
1
4
+
2
7
9
11
=
(1+
5
7
+
1
2
÷
3
4
2
7
=
 (
3
50
×101-
3
50
)÷(150+30÷
1
15
)
=
3
4
÷[(
1
16
+
1
20
)×(1÷
3
20
)]
=
1
5
÷
2
3
×
5
24
÷
7
12
=
分析:依據(jù)四則運(yùn)算順序:先算第二級(jí)運(yùn)算,再算第一級(jí)運(yùn)算,如果只含有同一級(jí)運(yùn)算,按照從左到右順序計(jì)算,有括號(hào)先算括號(hào)里面的順序解答,
(4)運(yùn)用乘法分配律解答即可.
解答:解:(1)
4
7
×[15×(
1
3
-
3
10
)+
7
8
]
,
=
4
7
×
[15×
1
30
+
7
8
],
=
4
7
×
[
1
2
+
7
8
],
=
4
7
×
11
8

=
11
14
;

(2)18÷
6
7
-(
1
4
+
2
7
9
11
,
=18÷
6
7
-
15
28
×
9
11
,
=21-
135
308
,
=20
173
308
;

(3)(1+
5
7
+
1
2
÷
3
4
2
7
,
=(1+
5
7
+
2
3
)×
2
7

=
50
21
×
2
7
,
=
100
147


(4)(
3
50
×101-
3
50
)÷(150+30÷
1
15
)
,
=(101-1)×
3
50
÷(150+450),
=6+600,
=606;

(5)
3
4
÷[(
1
16
+
1
20
)×(1÷
3
20
)]
,
=
3
4
÷[
9
80
×
20
3
],
=
3
4
÷
3
4

=1;

(6)
1
5
÷
2
3
×
5
24
÷
7
12
,
=
3
10
×
5
24
÷
7
12
,
=
1
16
÷
7
12
,
=
3
28
點(diǎn)評(píng):本題考查知識(shí)點(diǎn):(1)依據(jù)四則運(yùn)算順序正確進(jìn)行計(jì)算,(2)運(yùn)用乘法分配律解決問(wèn)題.
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