问题 解答题
能简便的要用简便方法计算
12÷0.4÷
3
4
5
17
÷9+
1
9
×
5
17
4
9
÷[(
5
6
-
1
2
)+(
5
9
-
5
18
)]
1.8×
3
4
+1.2×
3
4
-
3
4
1
3
÷
1
2
-
5
4
×
2
5
315÷(36%+9%)
答案

(1)12÷0.4÷
3
4

=12÷

2
5
÷
3
4

=12×

5
2
×
4
3

=40;

(2)

5
17
÷9+
1
9
×
5
17
=
5
17
×
1
9
+
1
9
×
5
17

=

1
9
×
5
17
×2

=

10
153

(3)

4
9
÷[(
5
6
-
1
2
)+(
5
9
-
5
18
)]

=

4
9
÷[
1
3
+
5
18
]

=

4
9
÷
11
18

=

8
11

(4)1.8×

3
4
+1.2×
3
4
-
3
4

=(1.8+1.2-1)×

3
4

=

3
2

(5)

1
3
÷
1
2
-
5
4
×
2
5

=

1
3
×2-
5
4
×
2
5

=

2
3
-
1
2

=

1
6

(6)315÷(36%+9%)

=315÷(0.36+0.09)

=315÷0.45

=700;

故答案为40;

10
153
8
11
3
2
1
6
;700.

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