(x-2)6=(x-2)8
Tim so tu nhien x biet
x mu 2 - 3x + 2 = 6
Tim cac so tu nhien x,y biet
\(x^2-3x+2=6\Rightarrow x^2-2x-x+2=6\Rightarrow x\left(x-2\right)-\left(x-2\right)=6\)
\(\Rightarrow\left(x-1\right)\left(x-2\right)=6\) Vì x-1>x-2 nên ta có bảng:
x-1 | -1 | -2 | 6 | 3 |
x-2 | -6 | -3 | 1 | 2 |
x | 0 và 4(loại) | -1(TM) | 7 và 3 | 4(TM) |
Vậy x\(\in\left\{-1,1\right\}\)
2 - 3x + 2 = 6
\(\Rightarrow\)2 - 3x = 6 - 2
\(\Rightarrow\)2 - 3x = 4
\(\Rightarrow\)3x = 4 + 2
\(\Rightarrow\)3x = 6
\(\Rightarrow\)x = 6 : 3
\(\Rightarrow\)x = 2
vậy x = 2
tim x dua vao quan he uoc boi:
tim so tu nhien x sao cho x-1 la uoc cua 12
tim so tu nhien x sao cho 2x+1 la uoc cua 28
tim so tu nhien x sao cho x+15 la boi cua x+3
tim cac so nguyen x,y sao cho (x+1)(y-2)=3
tim so nguyen x sao cho(x+2).(y-1)=2
tim so nguyen to x vua la uoc cua 275 vua la uoc cua 180
tim so nguyen to x,y biet x+y=12 va UCLL (x:y)=5
tim so tu nhien x,y biet x+y=32 va UCLL (x:y)=8
tim so tu nhien x biet x chia het cho10; xchia het cho12; x chia het cho15 va 100<x<150
tim so x nho nhat khac 0b biet x chia het cho 24 va 30
40 chia het cho x . 56 chia het cho x va x>6
Tim so tu nhien x biet:
a,x+(x+1)+(x+2)+...+(x+2010)=2029099
b,2+4+6+8+...+2x=210
a)
\(x+\left(x+1\right)+\left(x+2\right)+...+\left(x+2010\right)=2029099\\ 2011.x+\left(1+2+3+...+2010\right)=2029099\\ 2011.x+2021055=2029099\\ 2011.x=2029099-2021055\\ 2011.x=8044\\ x=8044:2011\\ x=4\)
b)
\(2+4+6+...+2x=210\\ 2.\left(1+2+3+...+x\right)=210\\ 1+2+3+...+x=210:2\\ 1+2+3+...+x=105\\ \dfrac{x.\left(x+1\right)}{2}=105\\ x.\left(x+1\right)=105.2\\ x\left(x+1\right)=210\\ x.\left(x+1\right)=14.15\\\Rightarrow x=14\)
a) x+(x+1)+(x+2)+...+(x+2010)=2029099
x+x+1+x+2+...+x+2010=2029099
2011x+[(2010+1).2010:2]=2029099
2011x+2021055=2029099
2011x=2029099-2021055
2011x=8044
x=8044:2011
x=4
Vậy x=4.
b) 2+4+6+8+...+2x=210
(2x+2)*14:2=210
(2x+2)*7=210
2x+2=210:7
2x+2=30
2x=30-2
2x=28
x=28:2
x=14
Vậy x=14.
tim so tu nhien ,biet:\(x.\left[x+1\right]=2+4+6+8+...+2500\)
Ta có VP(vế phải ) có : (2500-2):2+1=1250(số hạng )
VP =(2500+2)*1250:2=1563750
Theo bài ra ta có :x*[x+1] = 1563750=1250*1251
Vậy x = 1250
\(x\left(x+1\right)=2+4+6+8+..+2500\)
\(\Leftrightarrow x\left(x+1\right)=\frac{2502.1250}{2}=\frac{1251.2.1250}{2}=1250.1251\)
\(\Leftrightarrow x=1250\)
Ta có:\(x\left(x+1\right)=\left(2+2500\right)+\left(4+2498\right)+...+\left(1250+1252\right)\)có 625 cặp
\(\Rightarrow x\left(x+1\right)=625\cdot2502=1563750\)=>x=1250
tim x biet 2<x<3 biet x la so tu nhien
nếu là số tự nhiên thì ko có giá trị x nào thỏa mãn
cho biet X la so tu nhien va {x mũ 2-[6 mũ 2 -(8 mũ 2 - 9.7) mũ 3-7.5]mũ 3 } =89-102
dung minh cung nghi the kho ra lam
{ x2 - [ 62 - ( 82 - 9.7)3 - 7.5]3 - 5.3 }3 = 1
{ x2 + [ 36 - (64 - 63)3 - 35]3 - 15}3 = 1
[ x2 - ( 36 - 13 - 35 ) - 15 ]3 = 1
[ x2 - ( 36 - 1 - 35 ) - 15]3 = 1
[ x2 - ( 35 - 35 ) - 15]3 = 1
[ x2 - 0 - 15]3 = 1
( x2 - 15 )3 = 1
<=> ( x2 - 15)3 = 13
=> x2 - 15 = 1
<=> x2 = 16
=> x = 4
tim so tu nhien x biet
a) 2.x -138=23.32
b)231-(x-6)=1339:13
a) \(2x-138=2^3.3^2\)
\(\Rightarrow2x-138=72\)
\(\Rightarrow2x=210\)
\(\Rightarrow x=105\)
b) \(231-\left(x-6\right)=1339:13\)
\(\Rightarrow231-\left(x-6\right)=103\)
\(\Rightarrow x-6=110\)
\(\Rightarrow x=116\)
a) \(2.x-138=2^3.3^2\)
\(2.x-138=8.9\)
\(2.x-138=72\)
\(2x=72+138\)
\(2x=210\)
\(x=210:2\)
\(x=105\)
\(231-\left(x-6\right)=1339:13\)
\(231-\left(x-6\right)=103\)
\(x-6=231-103\)
\(x-6=128\)
\(x=128+6\)
\(x=134\)
\(2x-138=2^3.3^2\)
\(2x-138=8.9\)
\(2x-138=72\)
\(2x=72+138\)
\(2x=210\)
\(x=210:2\)
\(x=105\)
b)\(231-\left(x-6\right)=1339:13\)
\(231-\left(x-6\right)=103\)
\(\left(x-6\right)=231-103\)
\(\left(x-6\right)=128\)
\(x=128+6\)
\(x=134\)
T mk nhé bạn ^...^ ^_^
3022x-6+45=46
Tim so tu nhien x biet
(x+1)+(x+2)+(x+3)+....+(x+100)=5950
a) Ta có: 302^(2x-6) +45 = 46
=> 302^(2x-6) = 1 = 302^0
=> 2x-6 = 0
=> 2x = 6
=> x = 3
b) Ta có: (x+1)+(x+2)+(x+3)+....+(x+100)=5950
=> 100x+ (1+2+3+4+...+100) = 5950
=> 100x + 5050 = 5950
=> 100x = 900
=> x = 9
Nhấn đúng cho mk nha!!!!!!!!
tim so tu nhien x biet x+5=2
x + 5 = 2
x = 2 + 5
x = 7
k cho mik đi các bn ơi !!! làm ơn
Vì x thuộc N và
x + 5 = 2
x = 2 - 5
Mà x = -3
=> x thuộc Z ko thuộc N
Vậy x vô giá trị