题目内容
脱式计算,能简算的要简算.
[1-(
|
| 75-7.5+25-42
| ||||||||||||||||
| 0.8×4×12.5×2.5 | 65-40÷1
|
(1)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=9;
(2)
×
÷(
-
),
=
×
÷
,
=
÷
,
=
;
(3)75-7.5+25-42
,
=(75+25)-(7.5+42
),
=100-50,
=50;
(4)
+
×
+
,
=
+
+
,
=
+(
+
),
═
+1,
=1
;
(5)0.8×4×12.5×2.5,
=(0.8×12.5)×(2.5×4),
=10×10,
=100;
(6)65-40÷1
×12.5%,
=65-24×12.5%,
=65-3,
=62.
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 24 |
=[1-
| 5 |
| 8 |
| 1 |
| 24 |
=
| 3 |
| 8 |
| 1 |
| 24 |
=9;
(2)
| 1 |
| 7 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
| 15 |
=
| 1 |
| 7 |
| 2 |
| 3 |
| 4 |
| 15 |
=
| 2 |
| 21 |
| 4 |
| 15 |
=
| 5 |
| 14 |
(3)75-7.5+25-42
| 1 |
| 2 |
=(75+25)-(7.5+42
| 1 |
| 2 |
=100-50,
=50;
(4)
| 1 |
| 7 |
| 7 |
| 8 |
| 5 |
| 7 |
| 3 |
| 8 |
=
| 1 |
| 7 |
| 5 |
| 8 |
| 3 |
| 8 |
=
| 1 |
| 7 |
| 5 |
| 8 |
| 3 |
| 8 |
═
| 1 |
| 7 |
=1
| 1 |
| 7 |
(5)0.8×4×12.5×2.5,
=(0.8×12.5)×(2.5×4),
=10×10,
=100;
(6)65-40÷1
| 2 |
| 3 |
=65-24×12.5%,
=65-3,
=62.
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