(1)(x-m)^2=n^2 (x-m)^2-n^2=0 (x-m-n)(x-m+n)=0 x1=m+n x2=m-n
1、(x-m)^2=n^2 2、5(x+6)^2-15=0 3、2(x+6)^2+7=3 4、(x-2)^2+2=11
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