Toán Lớp 8: Tìm x
(1/4 – x)^2 – 125% = 1 13/16
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Toán Lớp 8: Tìm x
(1/4 – x)^2 – 125% = 1 13/16
Comments ( 2 )
=>(1/4-x)^2-125/100=1+13/16
=>(1/4-x)^2=1+13/16+125/100
=>(1/4-x)^2=1+13/16+5/4
=>(1/4-x)^2=(4/4+5/4)+13/16
=>(1/4-x)^2=9/4+13/16
=>(1/4-x)^2=36/16+13/16
=>(1/4-x)^2=(36+13)/16
=>(1/4-x)^2=49/16
=>[((1/4-x)^2=(7/4)^2),((1/4-x)^2=(-7/4)^2):}
=>[(1/4-x=7/4),(1/4-x=-7/4):}
=>[(x=1/4-7/4),(x=1/4+7/4):}
=>[(x=-6/4),(x=8/4):}
=>[(x=-3/2),(x=2):}
Vậy x\in{-3/2;2}