题目内容
计算
(1)
+9
+99
+999
+9999
(2)4
-(2
+
)
(3)35÷
×1-
(4)(111+999)÷[56×(
-
)].
(1)
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
(2)4
| 4 |
| 5 |
| 4 |
| 5 |
| 5 |
| 12 |
(3)35÷
| 7 |
| 8 |
| 2 |
| 7 |
(4)(111+999)÷[56×(
| 3 |
| 7 |
| 3 |
| 8 |
(1)
+9
+99
+999
+9999
,
=(1+10+100+1000+10000)-(0.2×5),
=11111-1,
=11110;
(2)4
-(2
+
),
=4
-2
-
,
=2-
,
=1
;
(3)35÷
×1-
,
=35×
×1-
,
=40-
,
=39
;
(4)(111+999)÷[56×(
-
)],
=1110÷(56×
-56×
),
=1110÷(24-21),
=1110÷3,
=370.
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
=(1+10+100+1000+10000)-(0.2×5),
=11111-1,
=11110;
(2)4
| 4 |
| 5 |
| 4 |
| 5 |
| 5 |
| 12 |
=4
| 4 |
| 5 |
| 4 |
| 5 |
| 5 |
| 12 |
=2-
| 5 |
| 12 |
=1
| 7 |
| 12 |
(3)35÷
| 7 |
| 8 |
| 2 |
| 7 |
=35×
| 8 |
| 7 |
| 2 |
| 7 |
=40-
| 2 |
| 7 |
=39
| 5 |
| 7 |
(4)(111+999)÷[56×(
| 3 |
| 7 |
| 3 |
| 8 |
=1110÷(56×
| 3 |
| 7 |
| 3 |
| 8 |
=1110÷(24-21),
=1110÷3,
=370.
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