(1)
4
5
÷[1÷(
5
8
-
1
4
)]
(2)(
1
2
+
5
12
×
2
3
7
9
(3)
7
2
+0.65÷1.3-30%
(4)0.36×
5
6
+
5
6
×0.64
分析:(1)(2)(3)依據(jù)四則運(yùn)算計(jì)算方法,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)里面的解答,
(4)運(yùn)用乘法分配律解答.
解答:解:(1)
4
5
÷[1÷(
5
8
-
1
4
)]
,
=
4
5
÷[1÷
3
8
],
=
4
5
÷
8
3
,
=
3
10


(2)(
1
2
+
5
12
×
2
3
7
9
,
=(
1
2
+
5
18
÷
7
9

=
14
18
÷
7
9
,
=1;

(3)
7
2
+0.65÷1.3-30%

=
7
2
+0.5-30%,
=4-30%,
=3.7;

(4)0.36×
5
6
+
5
6
×0.64
,
=(0.36+0.64)×
5
6

=1×
5
6
,
=
5
6
點(diǎn)評(píng):本題考查的知識(shí)點(diǎn):(1)四則運(yùn)算計(jì)算方法,(2)正確運(yùn)用乘法分配律.
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