固定式球阀结构:分解因式(x的平方减去5)的2次方-8(x的平方-5)+16
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(x2-5)2-8*(x2-5)+16
=(x2-5-4)2
=(x2-9)2
=(x+9)2*(x-9)2
(x2-5)2-8*(x2-5)+16
=(x2-5-4)2
=(x2-9)2
=(x+9)2*(x-9)2
(x2-5)2-8*(x2-5)+16
=(x2-5-4)2
=(x2-9)2
=(x+9)2*(x-9)2