题目内容

计算.
(1)3.6-[(7.5-5.7)×0.2]
(2)9÷(
1
2
-
1
4
+
1
8
)-3×7

(3)1
2
3
×(
1
2
-
1
3
1
6
×3
             
(4)[8
4
5
-(0.6+2
9
10
4
7
]÷1.7
(1)3.6-[(7.5-5.7)×0.2],
=3.6-[1.8×0.2],
=3.6-0.36,
=3.24;

(2)9÷(
1
2
-
1
4
+
1
8
)-3×7

=9÷
3
8
-3×7,
=24-21,
=3;

(3)1
2
3
×(
1
2
-
1
3
1
6
×3

=
5
3
×
1
6
÷
1
6
×3,
=(
5
3
×3)×(
1
6
÷
1
6
),
=5×1,
=5;

(4)[8
4
5
-(0.6+2
9
10
4
7
]÷1.7

=[8
4
5
-3.5×
4
7
]÷1.7

=[8
4
5
-2]÷1.7

=6.8÷1.7,
=4.
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