用递等式计算,能简算的简算2506-10517÷13+14×106[0.8+0.75×(0.65-0.25)]÷0.01455×7.6+112÷538+43.3×7611+11+2+11+2+3+…+

题目简介

用递等式计算,能简算的简算2506-10517÷13+14×106[0.8+0.75×(0.65-0.25)]÷0.01455×7.6+112÷538+43.3×7611+11+2+11+2+3+…+

题目详情

用递等式计算,能简算的简算
2506-10517÷13+14×106
[0.8+0.75×(0.65-0.25)]÷0.01
455×7.6+112÷
5
38
+43.3×76
1
1
+
1
1+2
+
1
1+2+3
+…+
1
1+2+3+…+50
题型:解答题难度:中档来源:不详

答案

(1)2506-10517÷13+14×106,
=2506-809+1484,
=1697+1484,
=3181;

(2)[0.8+0.75×(0.65-0.25)]÷0.01,
=[0.8+0.75×0.4]÷0.01,
=[0.8+0.3]÷0.01,
=1.1÷0.01,
=110;

(3)455×7.6+112÷class="stub"5
38
+43.3×76,
=455×7.6+112×7.6+433×7.6,
=(455+112+433)×7.6,
=1000×7.6,
=7600;

(4)class="stub"1
1
+class="stub"1
1+2
+class="stub"1
1+2+3
+…+class="stub"1
1+2+3+…+50

=1+2×(class="stub"1
2
-class="stub"1
3
+class="stub"1
3
-class="stub"1
4
+class="stub"1
4
+…+class="stub"1
50
-class="stub"1
51
),
=1+2×(class="stub"1
2
-class="stub"1
51
),
=1+class="stub"49
51

=class="stub"100
51

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