1)(1+y)(1-y+y²)
2)(b-5)³=b³-15b²+75b-125-125=b³-15b²+75b-250
3)(9a²+3a+1)(3a-1)=27a³-1
a=1/3
a³=1/27
27×1/27=1
1-1=0
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1)(1+y)(1-y+y²)
2)(b-5)³=b³-15b²+75b-125-125=b³-15b²+75b-250
3)(9a²+3a+1)(3a-1)=27a³-1
a=1/3
a³=1/27
27×1/27=1
1-1=0