Tìm x biết :
A ) 2x + 3x = 1505
B ) 928 - ( 31 + x ) = 128
Tìm số tự nhiên x biết:
(x-289).47=0
54. (84-x)=54
7.x-10=704
928-(31+x)=128
2.x+3.x=1505
5.x-x=4088
ai nhanh minh tick cho
a)x-289=0 d)31+x=928-128
x =0+289 x=800-31
x =289 x=769
Vây x=289 Vậy x=769
b)84-x=54:54 e)5x=1505
84-x=1 x=301
x=84-1 Vậy x=301
x=83 f)4.x=4088
Vậy x=83 x=1022
c)7.x=704+10 Vậy x=1022
x=714:7 nha!
x=102
Vậy x=102
(x-289).47=0
x-289=0:47
x-289=0
\(\Rightarrow\)x=0+289
Vậy x=289
54.(84-x)=54
84-x=54:54
84-x=1
\(\Rightarrow\)x=84-1
Vậy x=83
7.x-10=704
7.x=704+10
7.x=714
\(\Rightarrow\)x=714:7
Vậy x=102
928-(31+x)=128
31+x=928-128
31+x=800
\(\Rightarrow\)x= 800-31
Vậy x=769
2.x+3.x=1505
(2+3).x=1505
5.x=1505
\(\Rightarrow\)x=1505:5
Vậy x= 301
5.x-x=4088
(5-1).x=4088
4.x=4088
x=4088:4
Vậy x= 1022
a)(x-289).47=0
=>x-289=0
=>x=289
b)54. (84-x)=54
=>84-x=1
=>x=83
c)7.x-10=704
=>7*x=714
=>x=102
d)928-(31+x)=128
=>31+x=800
=>x=769
e)2.x+3.x=1505
=>x(2+3)=1505
=>x*5=1505
=>x=301
g)5.x-x=4088
=>x(5-1)=4088
=>x*4=4088
=>x=1022
tìm số nguyên x biêtd 928-(31+x)=128 ; b 18:x và -5
928 - (31 + x) = 128
31 + x = 928 - 128
31 + x = 800
x = 800 - 31
x = 769
b) 18 : x và x = -5
Thay số ⇒ 18 : (-5)
= -3,6
928-(31+x)=128
928-(31+x)=128
31+x=928-128
31+x=800
x=800-31
x=769
928-(31+x)=128
31+x=928-128
31+x=900
x=800-31
x=769
928 - ( 31 + x ) = 128
31 + x = 928 - 128
31 + x = 800
x = 800 - 31
x = 769
tìm x biết:
(928-128):x=100
(928-128):x=100
800:x=100
x=800:100
x=8
t tôi nha bn
tìm stn x :
a,2x + 3x = 1505
b,5x - x = 4088
a/ 2x + 3x = 1505
\(\Rightarrow\)5x = 1505
\(\Rightarrow\)x = 1505 : 5 = 301
Vậy x = 301
b/ 5x - x = 4088
\(\Rightarrow\)4x = 4088
\(\Rightarrow\)x = 4088 : 4 = 1022
Vậy x = 1022
a) 2x + 3x = 1505
=> 5x = 1505
x = 1505 : 5
x = 301
b) 5x - x = 4088
=> 4x = 4088
x = 4088 : 4
x = 1022
Tìm X ∈ N biết:
a,2x . 2x + 1=128
b,3x+1 . 3x=243
a)2x.2x+1=128
\(4x^2+1=128\)
\(\Rightarrow4x^2=127\)
\(\Rightarrow x^2=127\div4\)
\(\Rightarrow x^2=3.175\)
mà \(x\in N\) hay\(x^2\in N\)
\(\Rightarrow\)Không có x
b) 3x+1.3x=243
\(\Rightarrow\)3x+3x=243
\(\Rightarrow\)6x=243
\(\Rightarrow\)x=40,5
Mà \(x\in N\)
\(\Rightarrow\)Không có x
Tìm x biết:
\(2x+3x=1505\)
\(2x+3x=1505\)
\(\Rightarrow5x=1505\)
\(\Rightarrow x=1505:5\)
\(\Rightarrow x=301\)
\(2x+3x=1505\)
\(\Rightarrow5x=1505\)
\(\Rightarrow x=1505:5\)
\(\Rightarrow x=301\)
Vậy x = 301
Tìm x ∈ N , biết.
a) 3 x + 1 : 3 4 = 81
b) 3 x + 3 . 3 x + 1 = 729
c) 2 x + 3 . 2 x = 128
d) 23 + 3 x = 5 6 : 5 3
e) 2 x + 2 x + 4 = 272
Tìm x ∈ N, biết.
a, 3 x + 1 : 3 4 = 81
b, 3 x + 3 . 3 x + 1 = 729
c, 2 x + 3 . 2 x = 128
d, 23 + 3 x = 5 6 : 5 3
e, 2 x + 2 x + 4 = 272
a, 3 x + 1 : 3 4 = 81
3 x - 3 = 3 4
x – 3 = 4
x = 7
Vậy x = 7
b, 3 x + 3 . 3 x + 1 = 729
3 2 x + 4 = 3 6
2x + 4 = 6
x = 1
Vậy x = 1
c, 2 x + 3 . 2 x = 128
2 2 x + 3 = 2 7
2x + 3 = 7
x = 2
Vậy x = 2
d, 23 + 3 x = 5 6 : 5 3
23 + 3 x = 5 3
23 + 3x = 125
3x = 102
x = 34
Vậy x = 34
e, 2 x + 2 x + 4 = 272
2 x + 2 x . 2 4 = 272
2 x ( 1 + 2 4 ) = 272
2 x . 17 = 272
2 x = 16
2 x = 2 4
x = 4
Vậy x = 4