问题
解答题
(1)
(2)8x3+125=0 (3)(3
(4)(3+
(5)
(6)
|
答案
(1)原式=6
+33
+5
-52 3 3 5
=
-220 3
;5
(2)方程变形得:x3=-
,125 8
解得:x=-
;5 2
(3)原式=(3
-42
)(33
+42
)3
=(3
)2-(42
)23
=-30;
(4)原式=(3+
)[(3+10
)(3-10
)]200510
=-3-
;10
(5)原式=2-1-8×3
=-23;
(6)原式=
-1+2-2
+4-π+π-3.142
=1.86.