A= 31³ – 30.31² – 30.31 + 1 Tính A=? B= 71⁵ – 70.71⁴ – 70.71³ – 70.71² + 29 Tính B=?

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1. $A=31^2(31-30)-30.31+1$

   $=31^2-30.31+1$

   $=31(31-30)+1$

   $=31+1=32$

   $B=71^4(71-70)-70.71^3-70.71^2+29$

   $=71^4-70.71^3-70.71^2+29$

   $=71^3(71-70)-70.71^2+29$

   $=71^3-70.71^2+29$

   $=71^2(71-70)+29$

   $=71^2+29$

   $=5071+29=5070$

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