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)112+11
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)112+1112×(52?13)(4)(333+6...
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)112+1112×(52?13) (4)(333+667)÷[63×(47?49)] (5)130+142+156+172+190 (5)1998÷199819981999.
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(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)
+
×(
?
)
=
+
×(
-
),
=
+
×
,
=
+
,
=
+
,
=
;
(4)(333+667)÷[63×(
?
)]
=1000÷[63×
-63×
],
=1000÷[36-28],
=1000÷8,
=125;
(5)
+
+
+
+
=
+
+
+
+
,
=
=[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 |
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 |
=
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