Question

加油~~

只知道最後一題的答案是5

下列各式:
(3)x+4x²+1614.
OPPO Reno5 Z

山
(x-2)²-(x+2)2
(x+2)(x-2)
x÷4x+4-(X²+4X+4)
(2)
x3-1
X²+X-2
(x+2)(x-2)
(x-1)(x²
- 8x
(x+2) (
(x+2)(x-2)
演練27】
1.設x≠0x≠1, 試化簡
= x + 2
1
ㄨˋ
1
X
1
ㄨˊ
.試化簡下列各式:
OPPO Reno5 Z
2x²+3x+1
2x-1

27-2.試化簡下列各式:
(1)2x²+3x+1
x²–1
-
2x-1
x+1
。
可
OPPO Reno5 Z

【範例29】
29-1.若a+b=3,ab=1,試求:
(1) a²+b²=【
】(2) a³+b³ 【
】(3
29-2.設實數x,y滿足x+2y=3,x²+8=9,求x² + 42 =
x+2y³-6xy (x + 2y
=> x y = 1
=+b² = (a+b)²= Lab
3²-2
= 7
+b² = (a+b) ³ ³ ab(a+b)
33-3(3)
= 27-9
= 18
OPPO Reno5 Z
答案: (1
3) a-1)= (a+b)-4
2
= (a+b)² = 3²=
=(a+b)²= 5
=
a-b=±5
(4)