4
9
×(
4
5
-
11
20
1
9

1
6
×60%+
1
8
×40%

(1+25%)÷(1-
3
4
)

1-
9
16
÷
3
4
×
8
9
分析:(1)按照先算括號(hào)里面的減法,再按照從左到右順序解答,
(2)按照先同時(shí)計(jì)算乘法,再算加法順序解答,
(3)按照先同時(shí)計(jì)算括號(hào)里面的,再算除法順序解答,
(4)按照先算除法,再算除法,最后算減法順序解答.
解答:解:(1)
4
9
×(
4
5
-
11
20
÷
1
9

=
4
9
×
1
4
÷
1
9

=
1
9
÷
1
9

=1;

(2)
1
6
×60%+
1
8
×
40%
=
1
10
+
1
20

=
3
20
;

(3)(1+25%)÷(1-
3
4

=125%÷
1
4

=5;

(4)1-
9
16
÷
3
4
×
8
9

=1-
3
4
×
8
9

=1-
2
3

=
1
3
點(diǎn)評(píng):依據(jù)四則運(yùn)算計(jì)算方法正確進(jìn)行計(jì)算,是本題考查知識(shí)點(diǎn).
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