Toán Lớp 8: Rút gọn biểu thức:
(x+5)^3-15x(x+10)
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Toán Lớp 8: Rút gọn biểu thức:
(x+5)^3-15x(x+10)
Comments ( 2 )
= x3 + 15×2 + 75x + 125 – 15×2 – 150x
= x3 – 75x + 125
$=x^3+3x^2.5+3x.5^2+5^3-15x^2-150x$
$=x^3+15x^2+75x+125-15x^2-150x$
$=x^3-75x+125$