(1)(-12-13+56-712)×(-72).(2)8+(-3)2×(-2)-22.(3)(-1)2006-23÷(-4)3-18.(4)12×4+14×6+16×8+…+1198×200.-数学

题目简介

(1)(-12-13+56-712)×(-72).(2)8+(-3)2×(-2)-22.(3)(-1)2006-23÷(-4)3-18.(4)12×4+14×6+16×8+…+1198×200.-数学

题目详情

(1)(-
1
2
-
1
3
+
5
6
-
7
12
)×(-72)

(2)8+(-3)2×(-2)-22
(3)(-1)2006-23÷(-4)3-
1
8

(4)
1
2×4
+
1
4×6
+
1
6×8
+…+
1
198×200
题型:解答题难度:中档来源:不详

答案

(1)原式=-class="stub"1
2
×(-72)-class="stub"1
3
×(-72)+class="stub"5
6
×(-72)-class="stub"7
12
×(-72)
=36+24-60+42
=42;

(2)原式=8+9×(-2)-4
=8-18-4
=-14;

(3)原式=1-8÷(-64)-class="stub"1
8

=1+class="stub"1
8
-class="stub"1
8

=1;

(4)原式=class="stub"1
2
×(class="stub"1
2
-class="stub"1
4
)+class="stub"1
2
×(class="stub"1
4
-class="stub"1
6
)+class="stub"1
2
×(class="stub"1
6
-class="stub"1
8
)+…+class="stub"1
2
×(class="stub"1
198
-class="stub"1
200

=class="stub"1
2
×(class="stub"1
2
-class="stub"1
4
+class="stub"1
4
-class="stub"1
6
+class="stub"1
6
-class="stub"1
8
+…+class="stub"1
198
-class="stub"1
200

=class="stub"1
2
×(class="stub"1
2
-class="stub"1
200

=class="stub"1
2
×class="stub"99
200

=class="stub"99
400

更多内容推荐