X的平方—3X—10=0
==>(x-5)(x+2)=0
==>x-5=0或x+2=0
==>x=5或 x=-2
(X+3) (X—1)=5
==>x^2+2x-3=5
==>x^2+2x-8=0
==>(x+4)(x-2)=0
==>x+4=0 或x-2=0
==>x=-4或x=2
(X-2)的平方=3X-6
==>x^2-4x+4=3x-6
==>x^2-7x+10=0
==>(x-5)(x-2)=0
==>x-5=0或x-2=0
==>x=5或x=2
（X-1）的平方=1-X
==>x^2-2x+1=1-x
==>x^2-x=0
==>x(x-1)=0
==>x=0或x-1=0
==>x=0或x=1