Toán Lớp 7: Lm sao để lm câu này phân số khó quá
(2x+1)^2=4/9
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Toán Lớp 7: Lm sao để lm câu này phân số khó quá
(2x+1)^2=4/9
Comments ( 2 )
->(2x+1)^2=(+-2/3)^2
->[(2x+1=2/3),(2x+1=-2/3):}
->[(2x=2/3-3/3),(2x=-2/3-3/3):}
->[(2x=-1/3),(2x=-5/3):}
->[(x=-1/3:2),(x=-5/3:2):}
->[(x=-1/3 . 1/2),(x=-5/3 . 1/2):}
->[(x=-1/6),(x=-5/6):}
Vậy x\in{-1/6;-5/6}