问题
解答题
计算: (1)a
(2)(7+2
|
答案
(1)原式=2a
-2a
+3aa a 4
=2a
;19a a 4
(2)原式=72-(2
)2-(18-65
+1)=49-20-18+62
-1=10+62
.2
计算: (1)a
(2)(7+2
|
(1)原式=2a
-2a
+3aa a 4
=2a
;19a a 4
(2)原式=72-(2
)2-(18-65
+1)=49-20-18+62
-1=10+62
.2