题目内容

计算,能简便计算的要简便计算.
(1)(9+92+93)×0.01
(2)13.5×[1.5×(1.07+1.93)](3)
1
12
+
11
12
×(
5
2
-
1
3
)
(4)(333+667)÷[63×(
4
7
-
4
9
)]
(5)
1
30
+
1
42
+
1
56
+
1
72
+
1
90
(5)1998÷1998
1998
1999
(1)(9+92+93)×0.01
=[9+9×(9+9×9)]×0.01,
=[9+9×(9+81)]×0.01,
=[9+9×90]×0.01,
=[9+810]×0.01,
=819×0.01,
=8.19;

(2)13.5×[1.5×(1.07+1.93)]
=13.5×[1.5×3],
=13.5×4.5,
=60.75;

(3)
1
12
+
11
12
×(
5
2
-
1
3
)

=
1
12
+
11
12
×(
15
6
-
2
6
),
=
1
12
+
11
12
×
13
6

=
1
12
+
143
72

=
6
72
+
143
72

=
149
72


(4)(333+667)÷[63×(
4
7
-
4
9
)]
=1000÷[63×
4
7
-63×
4
9
],
=1000÷[36-28],
=1000÷8,
=125;

(5)
1
30
+
1
42
+
1
56
+
1
72
+
1
90

=
1
5×6
+
1
6×7
+
1
7×8
+
1
8×9
+
1
9×10

=
1
5
-
1
6
+
1
6
-
1
7
+
1
7
-
1
8
+
1
8
-
1
9
+
1
9
-
1
10

=
1
5
-
1
10

=
1
10


(5)1998÷1998
1998
1999

=1998÷
1998×1999+1998
1999

=1998×
1999
1998×(1999+1)

=
1999
2000
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