12x3=?
12X3+23=?
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
12x7+12x3. kb đc k
\(12.7+12.3\)
\(=12.\left(7+3\right)\)
\(=12.10\)
\(=120\)
\(12\times7+12\times3\)
\(=12\times\left(7+3\right)\)
\(=12\times10\)
\(=120\)
Hk tốt ~
-Trl
= 12 x ( 7 + 3 )
= 12 x 10
= 120
_Hc tốt
Tính lim x → - 1 x 2 + 2 x + 1 2 x 3 + 2 .
A. - ∞
B. 0
C. 1 2
D. + ∞