12X3+23=?
Tìm giới hạn B = lim x → + ∞ x x 2 + 1 - 2 x + 1 2 x 3 - 2 3 + 1
A. +∞
B. -∞
C. 4/3
D. 0
Tính
23×2
12x3
12x4
23×2 = 46
12x3 = 36
12x4 = 48
23×2=46
12x3=36
12x4=48
Học tốt!!
12x3=?
12 x 3 = 36
Tk mình, mình tk lại nhé sophie1029
x4 + 12x3 +48x2 + 72x + 36 = 0
\(\Leftrightarrow\left(x^4+6x^3+6x^2\right)+\left(6x^3+36x^2+36x\right)+\left(6x^2+36x+36\right)=0\)
\(\Leftrightarrow x^2\left(x^2+6x+6\right)+6x\left(x^2+6x+6\right)+6\left(x^2+6x+6\right)=0\)
\(\Leftrightarrow\left(x^2+6x+6\right)^2=0\)
\(\Leftrightarrow x^2+6x+6=0\)
\(\Rightarrow x=-3\pm\sqrt{3}\)
l i m x → - 1 2 x 3 + 2 x 2 + 3 - 2 bằng:
A. -∞
B. 2
C. 4/3
D. -4/3
12x3+12x4+12x5+12x6
12 x 3 + 12 x 4 + 12 x 5 + 12 x 6
= 12 x ( 3+4+5+6)
= 12 x 18 = 216
12x3+12x4+12x5+12x6=12x(3+4+5+6)=12x18=216
l i m x → 1 2 x 3 - 3 x + 1 2 - 2 x 2 bằng:
A. 1/2
B. 1/4
C. -3/4
D. -1/2
Chọn C
lim x → 1 2 x 3 − 3 x + 1 2 − 2 x 2 = lim x → 1 x − 1 2 x 2 + 2 x − 1 − 2 x − 1 x + 1 = lim x → 1 2 x 2 + 2 x − 1 − 2 x + 1 = − 3 4
12x3+45-32+134-98-23x7=
12x3=???
nhanh nhe