题目内容
| 神机妙算:(怎样简便就怎样算) 4+16÷
|
|
| ||||||||||||||
| 25×3.2×1.25 | 30
|
(1)4+16÷
,
=4+16×
,
=4+20,
=24;
(2)
÷
×64-1,
=
×
×64-1,
=
-1,
=
;
(3)
×[
-(
-
)],
=
×[
+
-
],
=
×[1-
],
=
×
,
=
;
(4)
×0.53+75%×1.47,
=0.75×0.53+0.75×1.47,
=(0.53+1.47)×0.75,
=2×0.75,
=1.5;
(5)25×3.2×1.25,
=25×0.4×8×1.25,
=10×(8×1.25),
=10×10,
=100;
(6)30
÷
,
=(30+
)×
,
=30×
+
×
,
=28+
,
=28
.
| 4 |
| 5 |
=4+16×
| 5 |
| 4 |
=4+20,
=24;
(2)
| 5 |
| 14 |
| 5 |
| 9 |
=
| 5 |
| 14 |
| 9 |
| 5 |
=
| 288 |
| 7 |
=
| 281 |
| 7 |
(3)
| 5 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 16 |
=
| 5 |
| 9 |
| 7 |
| 16 |
=
| 5 |
| 9 |
| 9 |
| 16 |
=
| 5 |
| 16 |
(4)
| 3 |
| 4 |
=0.75×0.53+0.75×1.47,
=(0.53+1.47)×0.75,
=2×0.75,
=1.5;
(5)25×3.2×1.25,
=25×0.4×8×1.25,
=10×(8×1.25),
=10×10,
=100;
(6)30
| 5 |
| 14 |
| 15 |
| 14 |
=(30+
| 5 |
| 14 |
| 14 |
| 15 |
=30×
| 14 |
| 15 |
| 5 |
| 14 |
| 14 |
| 15 |
=28+
| 1 |
| 3 |
=28
| 1 |
| 3 |
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