题目内容

用递等式计算(能简单的要简单)
①
5
9
+
4
9
×
9
20
÷
6
5
②
11
13
+
7
12
-(
11
13
-
5
12
)
③(1-25%)×101-
3
4
④197×
1
98
+
1
98
⑤
2
3
÷[
3
4
×(
17
18
-
8
9
)]
⑥
1
2007
×2001+
5
2007
+
1
2007
⑦3
1
2
:x=1
3
4
:(1.6×5)
①
5
9
+
4
9
×
9
20
÷
6
5
,
=
5
9
+
1
5
×
5
6
,
=
5
9
+
1
6
,
=
10
18
+
3
18
,
=
13
18
;

②
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
;

⑤
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;

⑥
1
2007
×2001+
5
2007
+
1
2007
,
=
2001
2007
+
5
2007
+
1
2007
,
=1;

⑦3
1
2
:x=1
3
4
:(1.6×5),
1
3
4
x=(1.6×5)×3
1
2
,
1
3
4
x÷1
3
4
=8×3
1
2
÷1
3
4
,
x=16.
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