tim so tu nhien x biet :(x-1)4=(x-1)8
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 ,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 2 so tu nhien x, y biet y/8 - x/8 = 1/8 va x<y
\(\frac{y}{8}-\frac{x}{8}=\frac{1}{8}\)
\(\Rightarrow\)\(y-x=1\)
Có rất nhiều đáp án mà bạn có thể lựa chọn
ta có: y/8 - x/8 = 1/8
=> y - x = 1
đề bài có cho thêm cái gì nữa ko, nếu ko thì có nhiều giá trị lắm.
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.
1. a) Tim so tu nhien a biet rang khi chia 39 cho a thi du 3 con chia cho 49 thi du 4
b)Tim so tu nhien x biet: 12 chia het cho ( x-2 )
c) Tim so tu nhien n biet: 1+3+5+...+(2n+1) = 72
mik dag gap lam bn nao giai dc nhanh mik tick cho
tim so tu nhien x va y biet:(x+4)=y(x+1)
tim so tu nhien x va y biet:(x+4)=y(x+1)
De tim so tu nhien x ,biet rang neu lay so do tru di 3 roi chia cho 8 thi dc 12 ,ta co the viet (x-3) :8=12roi tim x , ta duoc x =99.
Bang cach lam nhu tren ,hay tim so tu nhien x,biet rang neu no nhan voi 3 roi tru di 8 ,sau do chia cho 4 thi dc 7
tim so tu nhien x, biet rang moi so hang trg tong sau deu gap 2 lan so lien trc
1 + 2 + 4 + 8 + ......+ x = 1023