Toán Lớp 6: Tìm x
( 3x – 1 ) ³ =125. b . 28-5.(6-2x ) = 78
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Toán Lớp 6: Tìm x
( 3x – 1 ) ³ =125. b . 28-5.(6-2x ) = 78
Comments ( 2 )
( 3x- 1^3 ) = 125
( 3x – 1^3 ) = 5^3
3x – 1 = 5
3x = 5 + 1
3 . x = 6
x = 6 : 3
x = 2
Vậy x = 2
b . 28 – 5 . ( 6 – 2x ) = 78
5 . ( 6 – 2x ) = 28 – 78
5 . ( 6 – 2x ) = -50
6 – 2x = -50 : 5
6 – 2x = -10
2 . x = 6 – ( -10 )
2 . x = 6 + 10
2 . x = 16
x = 16 : 2
x = 8
Vậy x = 8