题目内容

用简便方法计算.
5
9
+
3
11
+
5
9
+
8
11
7
18
×
1
4
+
3
4
×
7
18
7
15
-(
7
15
-
3
7
)+
4
7
8×(4-3.75)÷0.1
7
12
-
5
18
)×12×18
(15.6+9.744÷2.4)×0.5.
(1)
5
9
+
3
11
+
5
9
+
8
11

=(
5
9
+
5
9
)+(
3
11
+
8
11
),
=
10
9
+1,
=2
1
9


(2)
7
18
×
1
4
+
3
4
×
7
18

=(
1
4
+
3
4
)×
7
18

=1×
7
18

=
7
18


(3)
7
15
-(
7
15
-
3
7
)+
4
7

=
7
15
-
7
15
+(
3
7
+
4
7
),
=0+1,
=1;

(4)8×(4-3.75)÷0.1
=8×0.25÷0.1,
=2÷0.1,
=20;

(5)(
7
12
-
5
18
)×12×18
=
7
12
×12×18-
5
18
×12×18,

=126-60,
=66;

(6)(15.6+9.744÷2.4)×0.5
=(15.6+4.06)×0.5,
=19.66×0.5,
=9.83.
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