Câu hỏi: d1:x=1-ty=tz=4t ,x-12=y+1-1=z,512,y=2x+1x+2m=±3z=x+yiz-3z-1+2iz1-i+z-1+i,,A=a2-b2

V=13Bhy=fxV=π53-2ln2T=a+bz1-z2z2-z11+i32-434cos2α=-45

S=abfxdxS=πabf2xdxS=1+log325S=1+ln25max0;1fx= 6y=m cos x+1cos x+m

A-1;-1;1y=x3-6x2+9x-2 , (P): 2x-2y+z+5=0(P)4z2-4z+3=0 ,  z1, z2d1, d2,d3S=9+99+999+...+99...99n so 9

n=2;-2;1log2x+1<1,    , 013x2+1dx01f''(x)1-xdx=1y=-x3+3x,m<12