89+2354-4538+51276-31075+49+59+3534-13+563-511-1711.-数学

512,
=
9
24
+
10
24

=
19
24


(4)
7
6
-
3
10

=
35
30
-
9
30

=
13
15


(5)
7
5
+
4
9
+
5
9
+
3
5

=(
7
5
+
3
5
)+(
4
9
+
5
9
),
=2+1,
=3;

(6)
3
4
-
1
3
+
5
6

=
9
12
-
4
12
+
10
12

=
9-4+10
12

=
5
4


(7)3-
5
11
-
17
11

=3-(
5
11
+
17
11
),
=3-2,
=1.

据专家权威分析,试题“89+2354-4538+51276-31075+49+59+3534-13+563-511-1711.-数学-魔..”主要考查你对  分数的加法和减法(异分母)  等考点的理解。关于这些考点的“档案”如下:

分数的加法和减法(异分母)