Toán Lớp 6: Tìm x
Câu 1: Tìm x
a) 3. ( x + 6 ) – 5^3 = 2. ( x – 8 ) – 1 b) ( 2 + x )^3 – 23 = 41
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Toán Lớp 6: Tìm x
Câu 1: Tìm x
a) 3. ( x + 6 ) – 5^3 = 2. ( x – 8 ) – 1 b) ( 2 + x )^3 – 23 = 41
Comments ( 2 )
3x + 18 – 125 = 2x – 16 – 1
3x – 2x = -17 – 18 + 125
x = 100
b) ( 2 + x )^3 – 23 = 41
2+x)^3 = 64 = 4^3
2+x = 4
x = 2
$\text{⇒3x + 18 – 125 = 2x – 16 – 1}$
$\text{⇒3x – 2x = -17 – 18 + 125}$
$\text{⇒ X =100}$
$\text{b,( 2 + x )³ – 23 = 41}$
$\text{⇒ 2+x)³ = 64 = 4³}$
$\text{⇒ 2+x = 4}$
$\text{⇒ X =2}$