题目内容
| 下面各题怎样简便怎样算. 401-
| [1-(
| 0.85×102 | ||||||||||||
| 35÷
|
|
(1)401-
-
-
,
=401-(
+
+
),
=401-1,
=400;
(2)[1-(
-
)]×
,
=[1-
]×
,
=
×
,
=
;
(3)0.85×102,
=0.85×(100+2),
=0.85×100+0.85×2,
=85+1.7,
=86.7;
(4)
×18+0.4×32,
=0.4×(18+32),
=0.4×50,
=20;
(5)35÷
×1-
,
=40×1-
,
=40-
,
=39
;
(6)
÷(1-
×
),
=
÷(1-
),
=
÷
,
=
.
| 1 |
| 7 |
| 2 |
| 7 |
| 4 |
| 7 |
=401-(
| 1 |
| 7 |
| 2 |
| 7 |
| 4 |
| 7 |
=401-1,
=400;
(2)[1-(
| 1 |
| 2 |
| 1 |
| 3 |
| 24 |
| 35 |
=[1-
| 1 |
| 6 |
| 24 |
| 35 |
=
| 5 |
| 6 |
| 24 |
| 35 |
=
| 4 |
| 7 |
(3)0.85×102,
=0.85×(100+2),
=0.85×100+0.85×2,
=85+1.7,
=86.7;
(4)
| 2 |
| 5 |
=0.4×(18+32),
=0.4×50,
=20;
(5)35÷
| 7 |
| 8 |
| 2 |
| 7 |
=40×1-
| 2 |
| 7 |
=40-
| 2 |
| 7 |
=39
| 5 |
| 7 |
(6)
| 2 |
| 3 |
| 3 |
| 4 |
| 5 |
| 6 |
=
| 2 |
| 3 |
| 5 |
| 8 |
=
| 2 |
| 3 |
| 3 |
| 8 |
=
| 16 |
| 9 |
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