问题
解答题
求下列各式的值: (1)-
(2)
(3)
(4)
(5)
|
答案
(1)原式=-
=3
-169 512 512 512
=343 512
; 7 8
(2)原式=
=20; (29+21)×(29-21)
(3)原式=
×1 3
-6 10
×10=-1 5
; 9 5
(4)原式=
+2 3
-1 3
-5 4
=-9 16
; 13 16
(5)原式=-6×
×2+3 4
=-4 3
.23 3