Toán Lớp 6: Tìm x biết :
( 3x + 1 )^3 = 64
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Toán Lớp 6: Tìm x biết :
( 3x + 1 )^3 = 64
Comments ( 2 )
( 3x + 1 )^3 = 64
=> ( 3x + 1 )^3 = 4^3
=> 3x + 1 = 4
=> 3x = 4 – 1
=> 3x = 3
=> x = 3 : 3
=> x = 1
$Vậy$ x = 1
Giải đáp:
$(3x+1)^3=64$
$(3x+1)^3=4^3$
$⇒ 3x+1=4$
$⇒ 3x=4-1$
$⇒ 3x=3$
$⇒ x=3:3$
$⇒x=1$
$Vậy$ $x=1$