题目内容

用递等式计算,能简算的要简算:
5
18
+
13
18
×9

11
27
+(
5
8
+
2
27
)×8
(5.6-1.6÷2)×2.5
5
6
+
7
12
+
3
8
)÷
1
48
1064-780÷0.75+8.25
8
9
-(
1
6
+0.25)
÷2.25.
(1)9×
5
18
+
13
18
×9,
=9×(
5
18
+
13
18
),
=9×1,
=9;

(2)
11
27
+(
5
8
+
2
27
)×8,
=
11
27
+
5
8
×8+
2
27
×8,
=(
11
27
+
16
27
)+5,
=1+5,
=6;

(3)(5.6-1.6÷2)×2.5,
=(5.6-0.8)×2.5,
=4.8×2.5,
=12;

(4)(
5
6
+
7
12
+
3
8
)÷
1
48

=
5
6
×48+
7
12
×48+
3
8
×48,
=40+28+18,
=86;

(5)1064-780÷0.75+8.25,
=1064-1040+8.25,
=24+8.25,
=32.25;

(6)
8
9
-(
1
6
+0.25)
÷2.25,
=
8
9
-
5
12
÷2.25,
=
8
9
-
5
27

=
19
27
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