题目内容

计算
(1)
4
5
+9
4
5
+99
4
5
+999
4
5
+9999
4
5

(2)4
4
5
-
(2
4
5
+
5
12
)
(3)35÷
7
8
×
1-
2
7

(4)(111+999)÷[56×(
3
7
-
3
8
)]
.
(1)
4
5
+9
4
5
+99
4
5
+999
4
5
+9999
4
5
,
=(1+10+100+1000+10000)-(0.2×5),
=11111-1,
=11110;

(2)4
4
5
-
(2
4
5
+
5
12
),
=4
4
5
-
2
4
5
-
5
12
,
=2-
5
12
,
=1
7
12
;

(3)35÷
7
8
×
1-
2
7
,
=35×
8
7
×1-
2
7
,
=40-
2
7
,
=39
5
7
;

(4)(111+999)÷[56×(
3
7
-
3
8
)]
,
=1110÷(56×
3
7
-56×
3
8
),
=1110÷(24-21),
=1110÷3,
=370.
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