Toán Lớp 6: c) (2x – 1) ³=-27
d) (2x + 1)=9
Tìm x
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Toán Lớp 6: c) (2x – 1) ³=-27
d) (2x + 1)=9
Tìm x
Comments ( 2 )
c) ( 2x – 1 )^3 = -27
⇒ ( 2x – 1 )^3 = ( -3 )^3
⇒ 2x -1 = -3
⇒ 2x = -2
⇒ x = -1
Vậy x =-1
d) ( 2x + 1 ) =9
⇒ 2x = 8
⇒ x = 4
Vậy x= 4
c) ( 2x-1)³= -27
⇔ ( 2x-1)³= (-3)³
⇔ 2x-1= -3
⇔ 2x= -2
⇔ x= -1
d) 2x+1=9
⇔ 2x = 8
⇔ x = 4
Chúc bạn học tốt !!!