问题
解答题
(1)(-
(2)8+(-3)2×(-2)-22. (3)(-1)2006-23÷(-4)3-
(4)
|
答案
(1)原式=-
×(-72)-1 2
×(-72)+1 3
×(-72)-5 6
×(-72)7 12
=36+24-60+42
=42;
(2)原式=8+9×(-2)-4
=8-18-4
=-14;
(3)原式=1-8÷(-64)-1 8
=1+
-1 8 1 8
=1;
(4)原式=
×(1 2
-1 2
)+1 4
×(1 2
-1 4
)+1 6
×(1 2
-1 6
)+…+1 8
×(1 2
-1 198
)1 200
=
×(1 2
-1 2
+1 4
-1 4
+1 6
-1 6
+…+1 8
-1 198
)1 200
=
×(1 2
-1 2
)1 200
=
×1 2 99 200
=
.99 400