2(x-2).2(x+3)=32
=>2(x-2)+(x+3)=25
=>(x-2)+(x+3)=5
=>x+x+(3-2)=5
=>2x+1=5
=>2x=5-1
=>2x=4
=>x=4:2
=>x=2
Vậy x=2
2(x-2).2(x+3)=32
=>2(x-2)+(x+3)=25
=>(x-2)+(x+3)=5
=>x+x+(3-2)=5
=>2x+1=5
=>2x=5-1
=>2x=4
=>x=4:2
=>x=2
Vậy x=2
Chứng minh rằng:
A = 1/3 + 1/32 + 1/33 + ..........+ 1/399 < 1/2
B = 3/12x 22 + 5/22 x 32 + 7/32 x 42 +............+ 19/92 x 102 < 1
C = 1/3 + 2/32 + 3/33 + 4/34 +.........+ 100/3100 ≤ 0
2.x-3/3 + -3/2 = 5 - 3.x /6 - 1/3
2/3.x - 3/12 = 4/5 - (7/x -2)
Help me a)4X=5Y=32 va 4y=32 ,x-y+z=36 ; b)x-1/2=y-2=3-z/3 và x+y+z=12 c) x/9=y/2=z/-2 và xyz=4
2^x=144-2^x+3
x.(x^2)^5=x^5
(x-5)^2+ly^2-4l=0
(x-0,2)^10+(y+3,1)^20=0
3x=4y=6z và x^2+y^2=25
3x=2y ;7y=5z và x-y+z=32
x+1/x+5=x-1/x-3
x-1/2=y-3/4=z-5/6 và 2x+5y-3z=32
tính : 8^2 x 125 x 9^2 - 32 x 5^3 x 81 phần 20^3 x 3^4 - 6^8 x 5^4
Tìm x
A.-2/3.x=(-1/2)^2
B.x÷(-2/5)^3=-2/5
C.2^x=32
D.16/2^x=2
E. (x-2)^2=9
.A) x/x+1=1/2 , B) x/2=x/3 , C) x+1/2=x+1/2017, i)3/x=x/2017 , O) x:3=x+1/2 , m) x+1/2=x+2/3 ,P) x+1/2=x , M) 2/x=x/8 , Q) x2/2=8/x2 , r) x3/2=32/x
tìm x
a)\(2^{x+1}=32\)
b) 3+3^x-2=810
c) \(\left(7^x\right)^2=7^{14}\)
d) \(\left(\left(-0.5\right)^x\right)=\frac{1}{32}\)
Bài 1: Tìm Max:
a) A= \(\dfrac{32}{x^2+2}\)
b) B= \(\dfrac{5}{2.\left(x+1\right)^2+3}\)