计算.(1)(718×518-118×518)÷13(2)(445-1.6×14)÷135÷12×2(3)89×[34-(716-0.25)]×(11×2+12×3+13×4+…+12010×2011

题目简介

计算.(1)(718×518-118×518)÷13(2)(445-1.6×14)÷135÷12×2(3)89×[34-(716-0.25)]×(11×2+12×3+13×4+…+12010×2011

题目详情

计算.
(1)(
7
18
×
5
18
-
1
18
×
5
18
1
3

(2)(4
4
5
-1.6×
1
4
)÷1
3
5
÷
1
2
×2

(3)
8
9
×[
3
4
-(
7
16
-0.25
)]×(
1
1×2
+
1
2×3
+
1
3×4
+…+
1
2010×2011
).
题型:解答题难度:中档来源:不详

答案

(1)(class="stub"7
18
×class="stub"5
18
-class="stub"1
18
×class="stub"5
18
)÷class="stub"1
3

=(class="stub"7
18
-class="stub"1
18
)×class="stub"5
18
×3,
=class="stub"1
3
×3×class="stub"5
18

=class="stub"5
18


(2)(4class="stub"4
5
-1.6×class="stub"1
4
)÷1class="stub"3
5
÷class="stub"1
2
×2
=(4.8-0.4)×class="stub"5
8
×2×2,
=4.4×class="stub"5
8
×4,
=11;

(3)class="stub"8
9
×[class="stub"3
4
-(class="stub"7
16
-0.25)]×(class="stub"1
1×2
+class="stub"1
2×3
+class="stub"1
3×4
+…+class="stub"1
2010×2011
),
=class="stub"8
9
×[class="stub"3
4
-(class="stub"7
16
-class="stub"1
4
)]×(1-class="stub"1
2
+class="stub"1
2
-class="stub"1
3
+class="stub"1
3
-class="stub"1
4
+…+class="stub"1
2010
-class="stub"1
2011
),
=class="stub"8
9
×[class="stub"3
4
+class="stub"1
4
-class="stub"7
16
]×(1-class="stub"1
2011
),
=class="stub"8
9
×[1-class="stub"7
16
class="stub"2010
2011

=class="stub"8
9
×class="stub"9
16
×class="stub"2010
2011

=class="stub"1005
2011

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