题目内容
| 神机妙算: 0.8×6.5-
|
(
|
1-
| ||||||||||||
| 25×1.25×32 | 99×
|
1
|
(1)0.8×6.5-
×3.5,
=0.8×6.5-0.8×3.5,
=(6.5-3.5)×0.8,
=3×0.8,
=2.4;
(2)(
+
)×45,
=
×45+
×45,
=3+35,
=38;
(3)1-
÷
+
,
=1-
×
+
,
=1-
+
,
=1;
(4)25×1.25×32,
=25×1.25×8×4,
=25×4×(1.25×8),
=100×10,
=1000;
(5)99×
+
,
=(99+1)×
,
=100×
,
=90;
(6)1
-
-
,
=1
-(
+
),
=1
-1,
=
.
| 4 |
| 5 |
=0.8×6.5-0.8×3.5,
=(6.5-3.5)×0.8,
=3×0.8,
=2.4;
(2)(
| 1 |
| 15 |
| 7 |
| 9 |
=
| 1 |
| 15 |
| 7 |
| 9 |
=3+35,
=38;
(3)1-
| 8 |
| 15 |
| 4 |
| 5 |
| 2 |
| 3 |
=1-
| 8 |
| 15 |
| 5 |
| 4 |
| 2 |
| 3 |
=1-
| 2 |
| 3 |
| 2 |
| 3 |
=1;
(4)25×1.25×32,
=25×1.25×8×4,
=25×4×(1.25×8),
=100×10,
=1000;
(5)99×
| 9 |
| 10 |
| 9 |
| 10 |
=(99+1)×
| 9 |
| 10 |
=100×
| 9 |
| 10 |
=90;
(6)1
| 9 |
| 14 |
| 7 |
| 8 |
| 1 |
| 8 |
=1
| 9 |
| 14 |
| 7 |
| 8 |
| 1 |
| 8 |
=1
| 9 |
| 14 |
=
| 9 |
| 14 |
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