题目内容

用递等式计算,能简算的要简算.
(1)46×8-120÷15
(2)
3
4
+2
9
17
+
1
4
+3
8
17

(3)(12.5×8-40)÷0.6
(4)
2
3
+(
4
5
-
2
3
5
3

(5)3.4×2.77+0.23×3.4
(6)(
5
12
+
1
9
+
3
8
)×72.
(1)46×8-120÷15,
=368-8,
=360;

(2)
3
4
+2
9
17
+
1
4
+3
8
17

=(
3
4
+
1
4
)+(2
9
17
+3
8
17
),
=1+6,
=7;

(3)(12.5×8-40)÷0.6,
=(100-40)÷0.6,
=60÷0.6,
=100;

(4)
2
3
+(
4
5
-
2
3
5
3

=
2
3
+
2
15
×
5
3

=
2
3
+
2
9

=
8
9


(5)3.4×2.77+0.23×3.4
=(2.77+0.23)×3.4,
=3×3.4,
=10.2;

(6)(
5
12
+
1
9
+
3
8
)×72
=
5
12
×
72+
1
9
×72+
3
8
×72,
=30+8+27,
=65.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网