问题
解答题
计算: (1)4×(-
(2)a(a-3)-(a-1)2. |
答案
(1)4×(-
)-1 36
+3-225
=-
-5+1 9 1 32
=-
-5+1 9 1 9
=-5;
(2)a(a-3)-(a-1)2
=a2-3a-(a2-2a+1)
=-a-1.
计算: (1)4×(-
(2)a(a-3)-(a-1)2. |
(1)4×(-
)-1 36
+3-225
=-
-5+1 9 1 32
=-
-5+1 9 1 9
=-5;
(2)a(a-3)-(a-1)2
=a2-3a-(a2-2a+1)
=-a-1.