问题
解答题
计算: (1)(-2)2-
(2)3(x2+2)-3(x+1)(x-1) |
答案
(1)原式=4-
+13 2
=
;7 2
(2)原式=3x2+6-3(x2-1)
=3x2+6-3x2+3
=9.
计算: (1)(-2)2-
(2)3(x2+2)-3(x+1)(x-1) |
(1)原式=4-
+13 2
=
;7 2
(2)原式=3x2+6-3(x2-1)
=3x2+6-3x2+3
=9.