$a,$ $1,6^2 + 4.0,8.3,4^2$
$=$ $2,56 + 3,2.11,56$
$=$ $2,56 + 36,992$
$=$ $39,552$
$b,$ $3^4.5^4 - (15^2 + 1)(15^2 - 1)$
$=$ $81.625 - 15^4 + 1$
$=$ $50625 - 50625 + 1$
$=$ $1$
$c,$ $x^4 - 12x^3 + 12x^2 - 12x + 111$
$=$ $x^4 - 12x(x^2 - x + 1) + 111$
Thay $x$ $=$ $11$
$=$ $11^4 - 12.11.(11^2 - 11 + 1) + 111$
$=$ $14641 - 132.(120 - 10) + 111$
$=$ $14641 - 132.110 + 111$
$=$ $14641 - 14520 + 111$
$=$ $121 + 111$
$=$ $232$
$d,$ $5x(4x^2 - 2x + 1) - 2x(10x^2 - 5x - 2)$
$=$ $20x^3 - 10x^2 + 5x - 20x^3 + 10x^2 + 4x$
$=$ $9x$
$e,$ $2004^2 - 16$
$=$ $(2004 - 4)(2004 + 4)$
$=$ $2000.2008$
$=$ $4016000$
$g,$ $892^2 + 892.216 + 108^2$
$=$ $892^2 + 892.108.2 + 108^2$
$=$ $(892 + 108)^2$
$=$ $1000^2$
$=$ $1000000$
Học tốt nhé!
