题目内容

计算下面各题,能用简便方法的要用简便方法.
76×99
36×(
5
9
+
1
4
-
1
2
2
3
+
1
2
÷
3
4
)×
1
4
4.05-1.8-1.2125×32×25
4
5
+
1
4
)÷
7
3
-
9
20
(1)76×99,
=76×(100-1),
=76×100-76,
=7600-76,
=7524;

(2)36×(
5
9
+
1
4
-
1
2
),
=36×
5
9
+36×
1
4
-
36×
1
2

=20+9-18,
=11;

(3)(
2
3
+
1
2
÷
3
4
)×
1
4

=(
2
3
+
1
2
×
4
3
)×
1
4

=(
2
3
+
2
3
)×
1
4

=
4
3
×
1
4

=
1
3


(4)4.05-1.8-1.2,
=4.05-(1.8+1.2),
=4.05-3,
=1.05;

(5)125×32×25,
=(125×8)×(4×25),
=1000×100,
=100000;

(6)(
4
5
+
1
4
)÷
7
3
-
9
20

=
21
20
×
3
7
-
9
20

=
9
20
-
9
20

=0.
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