5x+3-13=112
Giải các phương trình sau:
a) 5 x − 4 2 + 3 16 − 25 x 2 = 0
b) 4 x − 3 15 x − 1 12 − 3 = 15 x − 1 12 − 3 x − 5 .
(2.x-3)^3-13=112
(2.x-3)^3=112+13
(2.x-3)^3=125
=> (2.x-3)^3=125=5^3
=>(2.x-3)=5
=>2x=5+3
=>2x=8
=>x=8:2
=>x=4
Vậy x= 4
( 2x - 3 ) ^ 3 - 13 = 112
( 2x - 3 ) ^ 3 = 125
( 2x - 3 ) ^ 3 = 5 ^ 3
=> 2x - 3 = 5
2x = 8
x = 4
(2x-3)^3=112+13
(2x-3)^3=125
(2x-3)^3=5^3
2x-3=5
còn lại cậu tự giải
5x+3 -13 =112
Có: 5x+3 -13 =112
\(\Rightarrow\)5\(^{^{x+3}}\)=112+13=125
\(\Rightarrow\)5\(^{^{x+3}}\)= 5\(^3\)
\(\Rightarrow\)x+3=3
\(\Rightarrow\)x=0
Ta có : \(5^{x+3}-13=112\)
\(\Rightarrow5^{x+3}=125=5^3\)
\(\Rightarrow x+3=3\)
\(\Rightarrow x=3-3=0\)
Vậy x = 0
=> 5x+3=112+13
=> 5x+3=125
Ta có 125= 53
=> 5x+3 =53
=> x+3=3
=>x=0
Giải các phương trình sau:
a) 5 x + 3 x − 1 = 5 x + 7 ; b) 2 x − 1 4 + 3 = 1 − 3 x 6 ;
c) x − 3 2 − x x + 4 + 5 = 0 ; d) 3 x − 1 x + 2 3 − 2 x 2 + 1 2 = 11 2 .
a) x = 10 3 b) x = - 31 12
c) x = 7 5 d) x = 4
tính :
C=(112/13.20+112/20.27+112/27.34+...+112/62.69):(-5/9.13-7/9.25-13/19.25-31/19.69)
(112/13x20)+(112/20x27)+...+(112/62x69):(-5/9.13-7/9x25-13/19x25-31/19x69)
(112/13x20)+(112/20x27)+...+(112/62x69):(-5/9.13-7/9x25-13/19x25-31/19x69)
A =( 2/39 −1/15 −2/153 : 1/34 +3/20 −3/26) :( 1+2/71 −5/121: 65/121 −26/71 −13 )
B = ( 112/13.20 +112/20.27 +112/27.34 +...+112/62.69 ) :( −5/9.13 −7/9.25 −13/19.25 −31/19.69 )
mấy cái dấu / hay : là thay cho phân số
112-45+5x=87
45 + 5x = 112 -87
45 + 5x = 25
5x = 25 - 45
5x = -20
x = -20 : 5
x = -4
cho mình tim