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(2009•甘州区)正确、合理、灵活地计算.(1)4.9+0.1-4.9+0.1(2)12×3.7+5.2×0.5+1.1×50%(3)12×(13+12-16)(4)9.07×99+9.07(5)58×1110+38÷1011(6)2009×5.

题目详情
(2009•甘州区)正确、合理、灵活地计算.
(1)4.9+0.1-4.9+0.1          
(2)
1
2
×3.7+5.2×0.5+1.1×50%
(3)12×(
1
3
+
1
2
-
1
6
)          
(4)9.07×99+9.07
(5)
5
8
×
11
10
+
3
8
÷
10
11

(6)2009×5.
▼优质解答
答案和解析
(1)4.9+0.1-4.9+0.1  
=(4.9-4.9)+(0.1+0.1)
=0+0.2
=0.2;
        
(2)
1
2
×3.7+5.2×0.5+1.1×50%
=0.5×(3.7+5.2+1.1)
=0.5×10
=5;

(3)12×(
1
3
+
1
2
-
1
6
)     
=12×
1
3
+12×
1
2
−12×
1
6

=4+6-2
=8;
     
(4)9.07×99+9.07
9.07×(99+1)
=9.07×100
=907;

(5)
5
8
×
11
10
+
3
8
÷
10
11

=(
5
8
+
3
8
10
11

=
10
10

=
10
11


(6)2009×5
=2000×5+9×5
=10000+45
=10045.