wxf2006
花朵
共回答了4434个问题 举报
25x^2-1=0
(5x-1)(5x+1)=0
x=1/5或x=-1/5
15x^2+x^2=17^2
16x^2=17^2
16x^2-17^2=0
(4x+17)(4x-17)=0
x=-17/4或x=17/4
(2x-1)^2-16=0
(2x-1-4)(2x-1+4)=0
(2x-5)(2x+3)=0
x=5/2或x=-3/2
(x-1)^2-(2+1/4)=0
(x-1)^2-9/4=0
(x-1-3/2)(x-1+3/2)=0
(x-5/2)(x+1/2)=0
x=5/2或x=-1/2
1年前
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