题目内容
简便运算.
(
|
|
2
|
3.7×99+3.7. |
(1)(
+
+
)×105,
=
×105+
×105+
×105,
=35+21+7,
=56+7,
=63;
(2)
×
+25%×
+0.25×
,
=
×
+
×
+
×
,
=(
+
+
)×
,
=
×
,
=
;
(3)2
+3
-3
+1
+1
,
=(2
+1
-3
)+(1
+3
),
=(4-3
)+5,
=
+5,
=5
;
(4)3.7×99+3.7,
=3.7×(99+1),
=3.7×100,
=370.
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 15 |
=
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 15 |
=35+21+7,
=56+7,
=63;
(2)
| 3 |
| 7 |
| 1 |
| 4 |
| 2 |
| 7 |
| 1 |
| 7 |
=
| 3 |
| 7 |
| 1 |
| 4 |
| 1 |
| 4 |
| 2 |
| 7 |
| 1 |
| 4 |
| 1 |
| 7 |
=(
| 3 |
| 7 |
| 2 |
| 7 |
| 1 |
| 7 |
| 1 |
| 4 |
=
| 6 |
| 7 |
| 1 |
| 4 |
=
| 3 |
| 14 |
(3)2
| 3 |
| 7 |
| 5 |
| 9 |
| 3 |
| 7 |
| 4 |
| 9 |
| 4 |
| 7 |
=(2
| 3 |
| 7 |
| 4 |
| 7 |
| 3 |
| 7 |
| 4 |
| 9 |
| 5 |
| 9 |
=(4-3
| 3 |
| 7 |
=
| 4 |
| 7 |
=5
| 4 |
| 7 |
(4)3.7×99+3.7,
=3.7×(99+1),
=3.7×100,
=370.
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