问题
解答题
计算 (1)(-2)3+|1-
(2)(3x-2)(2x+3)-(x-1)2. |
答案
(1)(-2)3+|1-
|-2
+3 8 3 103
=-8+
-1-2+102
=
-1;2
(2)(3x-2)(2x+3)-(x-1)2
=6x2+9x-4x-6-(x2-2x+1)
=6x2+5x-6-x2+2x-1
=5x2+7x-7.
计算 (1)(-2)3+|1-
(2)(3x-2)(2x+3)-(x-1)2. |
(1)(-2)3+|1-
|-2
+3 8 3 103
=-8+
-1-2+102
=
-1;2
(2)(3x-2)(2x+3)-(x-1)2
=6x2+9x-4x-6-(x2-2x+1)
=6x2+5x-6-x2+2x-1
=5x2+7x-7.