a) \(\left(3x-2^4\right).7^3=2.7^4\)\(\Leftrightarrow3x-2^4=2.7^4:7^3\)
\(\Leftrightarrow3x-16=2.7\)\(\Leftrightarrow3x-16=14\)\(\Leftrightarrow3x=30\)
\(\Leftrightarrow x=10\)
Vậy \(x=10\)
b) \(3x+4x=\left|-75\right|+23\)\(\Leftrightarrow7x=75+23\)
\(\Leftrightarrow7x=98\)\(\Leftrightarrow x=14\)
Vậy \(x=14\)
a) \(\left(3x-2^4\right)\cdot7^3=2\cdot7^4\)
=> \(3x\cdot7^3-2^4\cdot7^3=2\cdot7\cdot7^3\)
=> \(3x\cdot7^3=14\cdot7^3+16\cdot7^3\)
=> \(3x\cdot7^3=\left(14+16\right)\cdot7^3\)
=> \(3x\cdot7^3=30\cdot7^3\)
=> \(3x=30\)(bỏ hai vế 73)
=> \(x=10\)
Vậy x = 10
b) \(3x+4x=\left|-75\right|+23\)
=> \(7x=75+23\)
=> \(7x=98\)
=> \(x=14\)
Vậy x = 14
a) ( 3x - 24 ). 73 = 2. 74
( 3x - 16 ) = 2 . (74 : 73 )
( 3x - 16) = 2 . 7
3x -16 = 14
3x = 14 + 16
3x = 30
x = 30 : 3
x = 10
Vậy x =10.
b) 3x + 4x = I - 75 I + 23
3x + 4x = 75 + 23
7x = 98
x = 98 : 7
x = 14.
Vậy x = 14.
Hok tốt !
a) (3x-2^4).7^3=4802
(3x-2^4)=402:7^3
(3x-2^4) = 14
3x=14+2^4
3x=30
x=30:3
x=10
Chúc bạn học tốt ^^
cho mk hỏi câu b I nghĩa là j vậy bạn
\(a,\left(3x-2^4\right).7^3=2.7^4\)
\(3x-2^4=2.7^4:7^3\)
\(3x-16=14\)
\(3x=30\Leftrightarrow x=10\)
\(b,3x+4x=|-75|+23\)
\(7x=75+23=98\)
\(x=14\)
3x+4x=/-75/+23
3x+4x=75+23
7x =98
x=98:7
=>x=14
