Tim x để A là 1 so nguỵen
X2 + 4x - 19
x - 3
so cac so nguyen x thoa man 15-|-2x+3|*|5+4x|=19 tim so cac so nguyen x giup minh nhe
!
tim so tu nhien x de 4x+19 chia het 2x-3
4x+19=2.(2x-3)+25
(4x+19)/(2x-3)=2+25/(2x-3)
vay (2x-3) thuoc U(25)=(1,5,25)
x=[U(25)+3]/2=(2,4,14)
ds: x=(2,4,14)
mong moi nguoi giup do
THANKS [THANK YOU]
a, x/3=x/7
b, x/y=-3/11
c, x/y-1=5/-19
Tim cac so nguyen x,y
18 x 19 x 20 x 21 x a= 3*91000 . Tim chu so *
18 x 19 x 20 x 21 x a= 3*91000
=> 143640xa=273000
=>a=273000:143640
=>a = 18,64754098
cho ham so y=f(x)=4x^2-5.a,tinh f(3).f(-1/2) b,tim x de f(x)=-1
\(a,\)
\(y=f\left(3\right)=4.3^2-5=31\)
\(y=f\left(-\frac{1}{2}\right)=4.\left(-\frac{1}{2}\right)^2-5=-4\)
\(b,\)
\(y=f\left(x\right)=4x^2-5\)
\(\Leftrightarrow4.x^2-5=-1\)
\(\Leftrightarrow4.x^2=4\)
\(\Leftrightarrow x^2=1\)
\(\Leftrightarrow x=1\)
y=ƒ (3)=4.3²−5=31
y=ƒ (−1/2 )=4.(−1/2 )2−5=−4
b,
y=ƒ (x)=4x2−5
⇔4.x2−5=−1
⇔4.x²=4
⇔x²=1
⇔x=1
chúc bn học tốt
1.cho dãy số 6;7;9;12;16;.... số thứ 100 của dãy số trên là
2.cho day so 2,3,5,9,17,33,65,129,... Tim so thu 11 cua day
3 .tim 2 phan so biet tich cua chung =8/15 .Biet cong them 4 vao phan so thu nhat thi tich hai phan so la 56/15
4.a chia 4 du 3;a chia 9 du 5 .Hoi a chia 36 du bao nhieu
5.tim(x;y) biet -|2x+4| -|y+5| lon hon bang 0 .Tim cap (x;y)
6.cho phan so a,b toi gian .chung minh 1-(a/b) toi gian
7.so sanh tong s=1/2+2/2^2+......+2015/2^2015 voi 2
8.tim a nho nhat sao cho khi chia a cho 7du 4 ,cho 11 du 6 ,cho 17 du 9
9.tim so tu nhien a va b ,a-b =5 va (a,b)/[a,b]=1/6
10. 3x+3x-1+3x-2=1053
11.5.36^9.4^6 -2.12^14.3^6/5.2^28.3^19-7.2^29.3^18
12.tìm n để n^2-7 chia hết n+3
13.2.2+4.4+6.6+....+98.98
tim cac so nguyen x, y biet
a)x/y=-3/11
b)x/y-1=5/-19
Tim x nguyen de phan so sau la so nguyen
4x-1/3-x
3) tim so tu nhien x biet
a) 450 : (3-19 )=50
b )3^2 x( x +4 ) -5^2 =5x 2^2
c )7x = 511: 5^9 +3^1
d) 6x =68 -2^ 19 :2^16
a/\(450:\left(x-19\right)=50\)
=>\(x-19=9\)
=>\(x=28\)
Vậy...
b/\(3^2.\left(x+4\right)-5^2=5x.2^2\)
\(9\left(x+4\right)=20x+25\)
\(20x+25=9x-36\)
\(11x=-61\)
\(x=-\dfrac{61}{11}\)
Vậy..
c/Tương tự
d/Tương tự