Question

a) 12 + x = 13

b) 716 - (x + 143 ) = 659

c) 2^x - 5 = 3

Answer 1

a) 12 + x = 13

=> x=12+13

=> x=25

vậy x=25

b) 716 - (x + 143 ) = 659

=> (x+143)=716-659

=> x+143=57

=> x=57-143

=> x=-86

vậy x=-86

c) 2^x - 5 = 3

=> 2^x=3+5

=>2^x=8

=>2^x=2³

=> x=3

vậy x=3

Answer 2

a) 12 + x = 13

x = 13 - 12

x = 1

c) \(^{2^x}\) - 5 = 3

\(^{2^x}\)= 5+3

\(^{2^x}\)=8

\(^{2^x}\)= \(^{2^3}\)

⇒x=3

Answer 3

a) 12 + x = 13

=> x = 13 - 12

=> x = 1

Vậy x = 1

b) 716 - ( x + 143 ) = 659

x + 143 = 716 - 659

x + 143 = 57

=> x = 57 - 143

=> x = - 86

Vậy x = - 86

c) 2^x - 5 = 3

=> 2^x = 3 + 5

=> 2^x = 8

=> 2^x = 2³

=> x = 3

Vậy x = 3

Answer 4