Toán Lớp 6: 75 – 5 . ( x + 4 ) = 30
4.2^x – 3 = 61
( x + 6 )^2 = 64
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Toán Lớp 6: 75 – 5 . ( x + 4 ) = 30
4.2^x – 3 = 61
( x + 6 )^2 = 64
giúp mik nhaaa
Comments ( 2 )
<=>5(x + 4) = 75 – 30 = 45
<=>x + 4 = 45 : 5 = 9
<=>x = 9 – 4 = 5
Vậy x = 5
4 . 2^{x – 3} = 64(theo mình phải là 64)
<=>2^{x – 3} = 64 : 4 = 16
<=>2^{x – 3} = 2^{4}
<=>x – 3 = 4
<=>x = 4 + 3 = 7
Vậy x = 7
(x + 6)^{2} = 64 = 8^{2}
<=>x + 6 = 8
<=>x = 8 – 6 = 2
Vậy x = 2
Vậy x = 2
Th2 : (x+6)^2 = (-8)^2
Vậy x in { 2, -14}