A= 31³ – 30.31² – 30.31 + 1 Tính A=? B= 71⁵ – 70.71⁴ – 70.71³ – 70.71² + 29 Tính B=? 25/07/2021 Bởi Genesis A= 31³ – 30.31² – 30.31 + 1 Tính A=? B= 71⁵ – 70.71⁴ – 70.71³ – 70.71² + 29 Tính B=?
$A=31^2(31-30)-30.31+1$ $=31^2-30.31+1$ $=31(31-30)+1$ $=31+1=32$ $B=71^4(71-70)-70.71^3-70.71^2+29$ $=71^4-70.71^3-70.71^2+29$ $=71^3(71-70)-70.71^2+29$ $=71^3-70.71^2+29$ $=71^2(71-70)+29$ $=71^2+29$ $=5071+29=5070$ Bình luận
$A=31^2(31-30)-30.31+1$
$=31^2-30.31+1$
$=31(31-30)+1$
$=31+1=32$
$B=71^4(71-70)-70.71^3-70.71^2+29$
$=71^4-70.71^3-70.71^2+29$
$=71^3(71-70)-70.71^2+29$
$=71^3-70.71^2+29$
$=71^2(71-70)+29$
$=71^2+29$
$=5071+29=5070$