问题
解答题
(1)计算:
(2)先化简,再求值:2(A+
|
答案
(1)原式=2
+1-2=22
-1;2
(2)原式=2(A2-3)-(A2-6A)+6=2A2-6-A2+6A+6=A2+6A,
当A=
-1时,原式=3-22
+62
-6=42
-3.2
(1)计算:
(2)先化简,再求值:2(A+
|
(1)原式=2
+1-2=22
-1;2
(2)原式=2(A2-3)-(A2-6A)+6=2A2-6-A2+6A+6=A2+6A,
当A=
-1时,原式=3-22
+62
-6=42
-3.2