因数分解２

[0]X2 -3X -70=

( X -10 )( X +7)

[1]X2 +14X +48=

( X +6 )( X +8)

[2]X2 -14X +24=

( X -2 )( X -12)

[3]X2 -9X +20=

( X -5 )( X -4)

[4]X2 +12X +27=

( X +3 )( X +9)

[5]X2 +5X -14=

( X -2 )( X +7)

[6]X2 +X -12=

( X -3 )( X +4)

[7]X2 -3X -70=

( X -10 )( X +7)

[8]X2 -14X +40=

( X -4 )( X -10)

[9]X2 +X -90=

( X +10 )( X -9)



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