题目内容

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)
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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