题目内容

用递等式计算(能简算的要简算).
(1)(
1
2
+
1
5
)÷(0.5-0.2)
(2)18÷[5.2÷(
6
5
-
2
3
+
1
3
)]÷
2
7

(3)(
3
4
-
1
12
-
1
24
)÷
1
48

(4)(999×1.01+9.9×99.9)÷5×
1
6

(1)(
1
2
+
1
5
)÷(0.5-0.2),
=0.7÷0.3,
=
7
3


(2)18÷[5.2÷(
6
5
-
2
3
+
1
3
)]÷
2
7

=18÷[5.2÷(
8
15
+
1
3
)]÷
2
7

=18÷[5.2÷
13
15
2
7

=18÷6÷
2
7

=3÷
2
7

=10.5;

(3)(
3
4
-
1
12
-
1
24
)÷
1
48

=(
3
4
-
1
12
-
1
24
)×48,
=
3
4
×48-
1
12
×48-
1
24
×48,
=36-4-2,
=30;

(4)(999×1.01+9.9×99.9)÷5×
1
6

=(99.9×10.1+9.9×99.9)÷5×
1
6

=99.9×(10.1+9.9)÷5×
1
6

=99.9×20÷5×
1
6

=1998÷5×
1
6

=399.6×
1
6

=66.6.
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