5(x-3)²=x²-9
5(x-3)²-(x²-9)=0
5(x-3)²-(x+3)(x-3)=0
(x-3)(5x-15-x-3)=0
(x-3)(4x-18)=0
(x-3)(x-4.5)=0
x1=3；x2=4.5
5(x-3)&78;=x&78;-9 5(x-3)&78;-(x&78;-9)=0 5(x-3)&78;-(x+3)(x-3)=0 (x-3)(5x-15-x-3)=0 (x-3)(4x-18)=0 (x-3)(x-4.5)=0 x1=3；x2=4.5 ...
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