问题 解答题
计算﹙用你喜欢的方法﹚
5
18
÷5+
1
18
×
1
5
0.25×1.25×32019.98×37-199.8×1.9+1998×0.82
1
6
-
1
4
+
1
3
﹚×12
[1-﹙
1
4
+
3
8
﹚]÷
3
4
[
9
16
+0÷﹙
1
7
+
7
8
﹚]×
4
3
20-[﹙
1
2
+
1
3
﹚÷
5
6
×1.2
4
7
×[15×﹙
1
3
-
3
10
﹚+
7
8
答案

(1)

5
18
÷5+
1
18
×
1
5

=

5
18
×
1
5
+
1
18
×
1
5

=(

5
18
+
1
18
)×
1
5

=

1
3
×
1
5

=

1
15

(2)0.25×1.25×320,

=0.25×1.25×(40×8),

=(0.25×40)×(1.25×8),

=10×10,

=100;

(3)19.98×37-199.8×1.9+1998×0.82,

=1998×0.37-1998×0.19+1998×0.82,

=1998×(0.37-0.19+0.82),

=1998×1,

=1998;

(4)﹙

1
6
-
1
4
+
1
3
﹚×12,

=

1
6
×12-
1
4
×12+
1
3
×12,

=2-3+4,

=3;

(5)[1-﹙

1
4
+
3
8
﹚]÷
3
4

=[1-

5
8
3
4

=

3
8
÷
3
4

=

1
2

(6)[

9
16
+0÷﹙
1
7
+
7
8
﹚]×
4
3

=[

9
16
+0]×
4
3

=

9
16
×
4
3

=

3
4

(7)20-[﹙

1
2
+
1
3
﹚÷
5
6
]×1.2,

=20-[

5
6
÷
5
6
]×1.2,

=20-1×1.2,

=20-1.2,

=18.8;

(8)

4
7
×[15×﹙
1
3
-
3
10
﹚+
7
8
],

=

4
7
×[15×
1
30
+
7
8
],

=

4
7
×[
1
2
+
7
8
],

=

4
7
×
11
8

=

11
14

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