问题 解答题
化简.
(1)
0.2+0.3+0.4+0.5
0.2×0.3×0.4×0.5

(2)2
2
15
÷(3
5
12
-2
11
16
)×2
5
8
+18
2
3

(3)(1
2
3
-1.6)÷[(3.15+1
13
20
)×1
3
4
]×12.6.
答案

(1)

0.2+0.3+0.4+0.5
0.2×0.3×0.4×0.5

=

1.4
0.012

=116

2
3

(2)2

2
15
÷(3
5
12
-2
11
16
)×2
5
8
+18
2
3

=2

2
15
÷
35
48
×
21
8
+18
2
3

=

32
15
×
48
35
×
21
8
+18
2
3

=7

17
25
+18
2
3

=26

26
75

(3)(1

2
3
-1.6)÷[(3.15+1
13
20
)×1
3
4
]×12.6,

=(1

2
3
-1
3
5
)÷[(3
3
20
+1
13
20
)×1
3
4
]×12.6,

=

1
15
÷[
24
5
×
7
4
]×12.6,

=

1
15
÷
42
5
×12.6,

=

1
15
×
5
42
×12.6,

=

1
10

单项选择题
单项选择题