用因式分解解方程:(1)25X눀–4=0

2024-11-22 08:09:09
推荐回答(3个)
回答(1):

过程如下
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(1)
25X²–4=0
(5x+2)(5x-2)=0
x=-2/5或x=2/5
(2)
2(t–1)²+t–1=0
(t-1)(2(t-1)+1)=0
(t-1)(2t-1)=0
t=1或t=1/2
(3)
X²+4X=–4
X²+4X+4=0
(x+2)²=0
∴x=-2
(4)
X²–X–20=0
(x-5)(x+4)=0
x=5或x=-4

回答(2):

(1) (2) (3)(x+2)^2=0 (4)
(5x-2)(5x+2)=0 (t-1)(2t-2+1)=0 x1=x2=-2 (x-5)(x+4)=0
x1=2/5 (t-1)(2t-1)=0 x1=5
x2=-2/5 t1=1,t2=1/2 x2=-4

回答(3):

(1) (5X+2)(5x-2)=0