问题 解答题
用递等式计算(能简单的要简单)
5
9
+
4
9
×
9
20
÷
6
5
11
13
+
7
12
-(
11
13
-
5
12
③(1-25%)×101-
3
4
④197×
1
98
+
1
98
2
3
÷[
3
4
×(
17
18
-
8
9
)]
1
2007
×2001+
5
2007
+
1
2007
3
1
2
:x=1
3
4
:(1.6×5)
答案

5
9
+
4
9
×
9
20
÷
6
5

=

5
9
+
1
5
×
5
6

=

5
9
+
1
6

=

10
18
+
3
18

=

13
18

11
13
+
7
12
-(
11
13
-
5
12
),

=

11
13
-
11
13
+
7
12
+
5
12

=1;

③(1-25%)×101-

3
4

=75%×101-75%,

=(101-1)×75%,

=100×75%,

=75;

④197×

1
98
+
1
98

=(196+1)×

1
98
+
1
98

=196×

1
98
+1×
1
98
+
1
98

=2+

1
98
×2,

=2

1
49

2
3
÷[
3
4
×(
17
18
-
8
9
)],

=

2
3
÷[
3
4
×(
17
18
-
16
18
)],

=

2
3
÷[
3
4
×
1
18
],

=

2
3
×24,

=16;

1
2007
×2001+
5
2007
+
1
2007

=

2001
2007
+
5
2007
+
1
2007

=1;

3

1
2
:x=1
3
4
:(1.6×5),

1

3
4
x=(1.6×5)×3
1
2

1

3
4
1
3
4
=8×3
1
2
÷1
3
4

x=16.

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