Toán Lớp 9: (x+1) ² – x ²>0 giải phương trình
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Toán Lớp 9: (x+1) ² – x ²>0 giải phương trình
Comments ( 2 )
<=>x^2+2x+1-x^2>0
<=>2x+1>0
<=>2x> -1
<=>x> -1/2
<=>(x+1-x)(x+1+x)>0
<=>2x+1>0
<=>2x> -1
<=>x> -1/2