Mathematics
Senior High

より のあとがなぜこうなるのかわかりません

4 (1) x³-x+1= a (x-1)³ +b(x-1)²+c(x-1)+d より x³ -x+1=ax³+(-3a+b)x² +(3a-2b+c) x-a+b=c+d

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