试题:
计算n面各题,能简算的要简算.
4
÷(x-
着x
-
着x

4
9
÷[
6
-(
6
+
x
)]
2少%×
着着
9
-2少%×
2
9

2
9
×f.x7少÷
6
7

答案:

我来补答
(1)
1
4
÷(c-
5
1c
-
8
1c

=
1
4
÷[c-(
5
1c
+
8
1c
)]
=
1
4
÷[c-1]
=
1
4
÷2
=
1
8


(2)
4
s
÷[
5
6
-(
1
6
+
1
c
)]
=
4
s
÷[
5
6
-
1
6
-
1
c
]
=
4
s
÷[
2
c
-
1
c
]
=
4
s
÷
1
c

=
4
s
×c
=
4
c


(c)25%×
11
s
-25%×
2
s

=
1
4
×
11
s
-
1
4
×
2
s

=
1
4
×(
11
s
-
2
s

=
1
4
×1
=
1
4


(4)
2
s
×a.c75÷
6
7

=
2
s
×
c
8
×
7
6

=
7
72
 
 
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这些题目你会做吗?