Toán Lớp 9: căn (x-1)+căn(4x-4)=3.giải pttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt
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Toán Lớp 9: căn (x-1)+căn(4x-4)=3.giải pttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt
Comments ( 2 )
ĐKXĐ: x>=1
<=>\sqrt{x-1}+\sqrt{4(x-1)}=3
<=>\sqrt{x-1}+2\sqrt{x-1}=3
<=>3\sqrt{x-1}=3
<=>\sqrt{x-1}=1
<=>x-1=1
<=>x=2(TM)
Vậy S={2}