题目内容
下面各题,怎样简便就怎样算.
375+450÷18×25
45×(
+
)
3÷2.5+0.45×4.8
(
-
)÷
×3.
375+450÷18×25
45×(
| 2 |
| 9 |
| 1 |
| 15 |
3÷2.5+0.45×4.8
(
| 1 |
| 3 |
| 1 |
| 5 |
| 2 |
| 3 |
(1)375+450÷18×25,
=375+450÷9÷2×25,
=375+625,
=1000;
(2)45×(
+
),
=45×
+45×
,
=10+3,
=13;
(3)3÷2.5+0.45×4.8,
=3÷5÷0.5+(0.5×0.8)×(0.9×6),
=1.2+2.16,
=3.36;
(4)(
-
)÷
×3,
=
×
×3,
=
.
=375+450÷9÷2×25,
=375+625,
=1000;
(2)45×(
| 2 |
| 9 |
| 1 |
| 15 |
=45×
| 2 |
| 9 |
| 1 |
| 15 |
=10+3,
=13;
(3)3÷2.5+0.45×4.8,
=3÷5÷0.5+(0.5×0.8)×(0.9×6),
=1.2+2.16,
=3.36;
(4)(
| 1 |
| 3 |
| 1 |
| 5 |
| 2 |
| 3 |
=
| 2 |
| 15 |
| 3 |
| 2 |
=
| 3 |
| 5 |
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