问题
解答题
计算: (1)(
(2)|1-
(3)(x-2)3=-0.125 (4)81x2-25=0. |
答案
(1)原式=2-4+4×1 2
=0;
(2)原式=
-1-2
×2 3
-1 2 2
=-
;4 3
(3)由题意得:(x-2)=
=-0.5,3 -0.125
解得:x=1.5.
(4)由题意得:x2=
,25 81
解得:x=
.5 9
计算: (1)(
(2)|1-
(3)(x-2)3=-0.125 (4)81x2-25=0. |
(1)原式=2-4+4×1 2
=0;
(2)原式=
-1-2
×2 3
-1 2 2
=-
;4 3
(3)由题意得:(x-2)=
=-0.5,3 -0.125
解得:x=1.5.
(4)由题意得:x2=
,25 81
解得:x=
.5 9