Объяснение:
1)9х+су+сх+9у=9(х+у)+с(х+у)=(9+с)(х+у)
2)20а⁴bc-28a²c²+15a²b²-21bc=a²(15b²-28c²)+bc(20a²-21)
3)x³-x²+x²y-2xy+y=xy(x-1)+x²(x-1)+y=(xy+x²)(x-1)+y
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Объяснение:
1)9х+су+сх+9у=9(х+у)+с(х+у)=(9+с)(х+у)
2)20а⁴bc-28a²c²+15a²b²-21bc=a²(15b²-28c²)+bc(20a²-21)
3)x³-x²+x²y-2xy+y=xy(x-1)+x²(x-1)+y=(xy+x²)(x-1)+y