问题 解答题
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.
答案

(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.

问答题 简答题
问答题 简答题