题目内容
下面各题怎样简便就怎样算.
(1)2.7×99+2.7
(2)
+
-
(3)3.93+1.64+6.07+8.36
(4)(7.9-3.06÷0.51)×5
(5)15-11.17-2.83
(6)15×(
+
)
(1)2.7×99+2.7
(2)
| 3 |
| 4 |
| 1 |
| 6 |
| 3 |
| 8 |
(3)3.93+1.64+6.07+8.36
(4)(7.9-3.06÷0.51)×5
(5)15-11.17-2.83
(6)15×(
| 1 |
| 3 |
| 1 |
| 5 |
(1)2.7×99+2.7,
=2.7×(99+1),
=2.7×100,
=270;
(2)
+
-
,
=
+
-
,
=
;
(3)3.93+1.64+6.07+8.36,
=(3.93+6.07)+(1.64+8.36),
=10+10,
=20;
(4)(7.9-3.06÷0.51)×5,
=(7.9-6)×5,
=1.9×5,
=9.5;
(5)15-11.17-2.83,
=15-(11.17+2.83),
=15-14,
=1;
(6)15×(
+
),
=15×
+15×
,
=5+3,
=8.
=2.7×(99+1),
=2.7×100,
=270;
(2)
| 3 |
| 4 |
| 1 |
| 6 |
| 3 |
| 8 |
=
| 18 |
| 24 |
| 4 |
| 24 |
| 9 |
| 24 |
=
| 13 |
| 24 |
(3)3.93+1.64+6.07+8.36,
=(3.93+6.07)+(1.64+8.36),
=10+10,
=20;
(4)(7.9-3.06÷0.51)×5,
=(7.9-6)×5,
=1.9×5,
=9.5;
(5)15-11.17-2.83,
=15-(11.17+2.83),
=15-14,
=1;
(6)15×(
| 1 |
| 3 |
| 1 |
| 5 |
=15×
| 1 |
| 3 |
| 1 |
| 5 |
=5+3,
=8.
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