问题 解答题
计算.
(1)55×66÷(11×11)
(2)40.2-4÷80×2.4
(3)3.5×[6.8-(1.6+3.6÷0.9)]÷84
(4)
1
8
×[
1
2
÷(
3
5
×
10
9
)]
(5)(
1
2
+
1
4
)÷(
4
5
÷4-
1
10
答案

(1)55×66÷(11×11),

=55×66÷11÷11,

=55÷11×(66÷11),

=5×6,

=30;

(2)40.2-4÷80×2.4,

=40.2-0.05×2.4,

=40.2-0.12,

=40.08;

(3)3.5×[6.8-(1.6+3.6÷0.9)]÷84,

=3.5×[6.8-(1.6+4)]÷84,

=3.5×[6.8-5.6]÷84,

=3.5×1.2÷84,

=4.2÷84,

=0.05;

(4)

1
8
×[
1
2
÷(
3
5
×
10
9
)],

=

1
8
×[
1
2
÷
2
3
],

=

1
8
×[
1
2
×
3
2
],

=

1
8
×
3
4

=

3
32

(5))(

1
2
+
1
4
)÷(
4
5
÷4-
1
10
),

=

3
4
÷(
4
5
×
1
4
-
1
10
),

=

3
4
÷(
1
5
-
1
10
),

=

3
4
÷
1
10

=

3
4
×10,

=

15
2

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