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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)
×3.7+5.2×0.5+1.1×50%
(3)12×(
+
-
)
(4)9.07×99+9.07
(5)
×
+
÷
(6)2009×5.
(1)4.9+0.1-4.9+0.1
(2)
1 |
2 |
(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)
×3.7+5.2×0.5+1.1×50%
=0.5×(3.7+5.2+1.1)
=0.5×10
=5;
(3)12×(
+
-
)
=12×
+12×
−12×
=4+6-2
=8;
(4)9.07×99+9.07
9.07×(99+1)
=9.07×100
=907;
(5)
×
+
÷
=(
+
)×
=1×
=
;
(6)2009×5
=2000×5+9×5
=10000+45
=10045.
=(4.9-4.9)+(0.1+0.1)
=0+0.2
=0.2;
(2)
1 |
2 |
=0.5×(3.7+5.2+1.1)
=0.5×10
=5;
(3)12×(
1 |
3 |
1 |
2 |
1 |
6 |
=12×
1 |
3 |
1 |
2 |
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 |
=1×
10 |
10 |
=
10 |
11 |
(6)2009×5
=2000×5+9×5
=10000+45
=10045.
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