Toán Lớp 7: A).(x-1/2)¹⁰=0
B).(2x-1)³= -8
C).(x+1/2)²=1/16
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Toán Lớp 7: A).(x-1/2)¹⁰=0
B).(2x-1)³= -8
C).(x+1/2)²=1/16
Giúp mình với mọi người
Comments ( 2 )
(x-1/2)^10=0
=>x-1/2=0
=>x=0+1/2
=>x=1/2
Vậy x=1/2
b)
(2x-1)^3=-8
=>(2x-1)^3=(-2)^3
=>2x-1=-2
=>2x=-2+1
=>2x=-1
=>x=-1/2
Vậy x=-1/2
c)
(x+1/2)^2=1/16
=>(x+1/2)^2=(+-1/4)^2
=>[(x+1/2=1/4),(x+1/2=-1/4):}
=>[(x=1/4-1/2),(x=-1/4-1/2):}
=>[(x=1/4-2/4),(x=-1/4-2/4):}
=>[(x=-1/4),(x=-3/4):}
Vậy x\in{-1/4;-3/4}