因数分解１

[0]X2 -4=

( X -2 )( X +2)

[1]X2 -225=

( X +15 )( X -15)

[2]X2 -1=

( X -1 )( X +1)

[3]X2 -144=

( X +12 )( X -12)

[4]X2 -16=

( X +4 )( X -4)

[5]X2 -121=

( X -11 )( X +11)

[6]X2 -81=

( X +9 )( X -9)

[7]X2 -121=

( X +11 )( X -11)

[8]X2 -225=

( X -15 )( X +15)

[9]X2 -64=

( X +8 )( X -8)



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