题目内容
简便计算
(1)62.8×19-8×62
-62
(2)9
-(3.75+4
)
(3)
-[1-(1-0.5×
)]
(4)
×10.1+0.4×
+(
-0.3)×0.3-40%
(1)62.8×19-8×62
| 4 |
| 5 |
| 4 |
| 5 |
(2)9
| 5 |
| 11 |
| 5 |
| 11 |
(3)
| 1 |
| 0.04 |
| 1 |
| 3 |
(4)
| 2 |
| 5 |
| 3 |
| 5 |
| 7 |
| 10 |
(1)62.8×19-8×62
-62
,
=62.8×(19-8-1),
=62.8×10,
=628;
(2)9
-(3.75+4
),
=9
-3.75-4
,
=9
-4
-3.75,
=5-3.75,
=1.25;
(3)
-[1-(1-0.5×
)],
=
-[1-(1-
)],
=
-[1-
],
=
-
,
=25-
,
=24
;
(4)
×10.1+0.4×
+(
-0.3)×0.3-40%,
=0.4×10.1+0.4×0.6+0.4×0.3-0.4,
=(10.1+0.6+0.3-1)×0.4,
=(11-1)×0.4,
=10×0.1,
=4.
| 4 |
| 5 |
| 4 |
| 5 |
=62.8×(19-8-1),
=62.8×10,
=628;
(2)9
| 5 |
| 11 |
| 5 |
| 11 |
=9
| 5 |
| 11 |
| 5 |
| 11 |
=9
| 5 |
| 11 |
| 5 |
| 11 |
=5-3.75,
=1.25;
(3)
| 1 |
| 0.04 |
| 1 |
| 3 |
=
| 1 |
| 0.04 |
| 1 |
| 6 |
=
| 1 |
| 0.04 |
| 5 |
| 6 |
=
| 1 |
| 0.04 |
| 1 |
| 6 |
=25-
| 1 |
| 6 |
=24
| 5 |
| 6 |
(4)
| 2 |
| 5 |
| 3 |
| 5 |
| 7 |
| 10 |
=0.4×10.1+0.4×0.6+0.4×0.3-0.4,
=(10.1+0.6+0.3-1)×0.4,
=(11-1)×0.4,
=10×0.1,
=4.
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