题目内容
下面各题怎样简便就怎样算.
(
+
)×
+
÷[1-(
+
)]
4×0.8×2.5×12.5
(2.8+3.85÷3.5)×4.6.
(
| 24 |
| 29 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
| 2 |
| 13 |
| 1 |
| 2 |
| 1 |
| 3 |
4×0.8×2.5×12.5
(2.8+3.85÷3.5)×4.6.
(1)(
+
)×
+
,
=
×
+
×
+
,
=
+
+
,
=
+(
+
),
=
+1,
=1
;
(2)
÷[1-(
+
)],
=
÷[1-
],
=
÷
,
=
;
(3)4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
(4)(2.8+3.85÷3.5)×4.6,
=(2.8+1.1)×4.6,
=3.9×4.6,
=17.94.
| 24 |
| 29 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
=
| 24 |
| 29 |
| 1 |
| 8 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
=
| 3 |
| 29 |
| 2 |
| 17 |
| 15 |
| 17 |
=
| 3 |
| 29 |
| 2 |
| 17 |
| 15 |
| 17 |
=
| 3 |
| 29 |
=1
| 3 |
| 29 |
(2)
| 2 |
| 13 |
| 1 |
| 2 |
| 1 |
| 3 |
=
| 2 |
| 13 |
| 5 |
| 6 |
=
| 2 |
| 13 |
| 1 |
| 6 |
=
| 12 |
| 13 |
(3)4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
(4)(2.8+3.85÷3.5)×4.6,
=(2.8+1.1)×4.6,
=3.9×4.6,
=17.94.
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