因数分解２

[0]X2 +20X +91=

( X +13 )( X +7)

[1]X2 -14X +40=

( X -4 )( X -10)

[2]X2 +16X +60=

( X +6 )( X +10)

[3]X2 +4X -117=

( X +13 )( X -9)

[4]X2 +18X +72=

( X +12 )( X +6)

[5]X2 -2X -24=

( X +4 )( X -6)

[6]X2 +X -42=

( X -6 )( X +7)

[7]X2 +11X +18=

( X +9 )( X +2)

[8]X2 -11X +24=

( X -3 )( X -8)

[9]X2 +19X +78=

( X +6 )( X +13)



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