问题
解答题
计算
(1)30-2-3+(-3)2
(2)a(a3)2+(a2)3-a•a5
(3)(x+2)2-(x-1)(x-2)
答案
(1)原式=1-
+9=91 8
;7 8
(2)a•a6+a6-•a6=a7;
(3)原式=x2-2x+4-x2+3x-2=x+2.
计算
(1)30-2-3+(-3)2
(2)a(a3)2+(a2)3-a•a5
(3)(x+2)2-(x-1)(x-2)
(1)原式=1-
+9=91 8
;7 8
(2)a•a6+a6-•a6=a7;
(3)原式=x2-2x+4-x2+3x-2=x+2.