Câu hỏi của AMD Ryzen 9-5900XS

Question

giúp mk nha (tìm x)

Nguyễn Lê Phước Thịnh · Accepted Answer

d: =>(x+2)3=8=>x+2=2hay x=0f: =>(2x-1)3=-27=>2x-1=-3=>2x=-2hay x=-1h: =>x3-3x2+3x-1=1=>x-1=1hay x=2Câu trả lời: d: =>(x+2)3=8=>x+2=2hay x=0f: =>(2x-1)3=-27=>2x-1=-3=>2x=-2hay x=-1h: =>x3-3x2+3x-1=1=>x-1=1hay x=2

Võ Thành Nhân · Answer

d) $\left(x+2\right)^3-8=0$$\Rightarrow$ $\left(x+2\right)^3=8$ $\Rightarrow$ $\left(x+2\right)^3=2^3$$\Rightarrow$ $x+2=2$ $\Rightarrow$ $x=0$f) $\left(2x-1\right)^3+27=0$$\Rightarrow$ $\left(2x-1\right)^3=-27$ $\Rightarrow$ $\left(2x-1\right)^3=\left(-3\right)^3$$\Rightarrow$ $2x-1=-3$ $\Rightarrow$ $x=-1$h) $x^3-3x^2+3x=2$$\Rightarrow$ $x^3-3x^2+3x=1+1$ $\Rightarrow$ $x^3-3x^2+3x-1=1$$\Rightarrow$ $\left(x-1\right)^3=1$ $\Rightarrow$ $x-1=1$ $\Rightarrow$ $x=2$Câu trả lời: d) $\left(x+2\right)^3-8=0$$\Rightarrow$ $\left(x+2\right)^3=8$ $\Rightarrow$ $\left(x+2\right)^3=2^3$$\Rightarrow$ $x+2=2$ $\Rightarrow$ $x=0$f) $\left(2x-1\right)^3+27=0$$\Rightarrow$ $\left(2x-1\right)^3=-27$ $\Rightarrow$ $\left(2x-1\right)^3=\left(-3\right)^3$$\Rightarrow$ $2x-1=-3$ $\Rightarrow$ $x=-1$h) $x^3-3x^2+3x=2$$\Rightarrow$ $x^3-3x^2+3x=1+1$ $\Rightarrow$ $x^3-3x^2+3x-1=1$$\Rightarrow$ $\left(x-1\right)^3=1$ $\Rightarrow$ $x-1=1$ $\Rightarrow$ $x=2$

Khoá học trên OLM (olm.vn)

Khoá học trên OLM (olm.vn)