Giải giùm em những phương trình thi HSG toán 9

[pe_phd]

1. x[SUP]4[/SUP]-3x[SUP]2[/SUP]+4x-3=0
2. x+1-căn(x-x[SUP]2[/SUP])=căn(x+x[SUP]2[/SUP])
3. căn(x+3)+căn(x+8)=5
4. 2x-x[SUP]2[/SUP]+căn(6x[SUP]2[/SUP]-12x+7)=0
5. (x-1)[SUP]2[/SUP]+2lx-1l-8=0
6. lx[SUP]2[/SUP]-1l+lx[SUP]2[/SUP]-4l=3
7. (2x[SUP]2[/SUP])/[3-căn(9+2x)][SUP]2[/SUP]=x+9

 

[namtuckhn]

1.<=> x[SUP]4 [/SUP] - 2x[SUP]2[/SUP] + 1 = x[SUP]2[/SUP] – 4x + 4

ó (x[SUP]2[/SUP] - 1)[SUP]2[/SUP] = (x – 2) [SUP]2[/SUP]


2.