Co bao nhieu phan so a/b ( voi a,b nguyen duong) thoa man a + b = 12.
a, co bao nhieu cap so nguyen ( x,y ) thoa man x + y=1
b. co bao nhieu cap so nguyen ( x,y ) thoa man x.2 + y =1
cau 1 ,cho m,n thuoc n va p la so nguyen to thoa man p/m-1=m+n/p
CMRp^2=n+2
cau 2,cho a,b,c thoa man a+b+c=0 CMRab+bc+ca be hon hoac bang 0
cau 3,bay gio la 4 gio 10 phut hoi sau it nhat bao lau thi hai kim dong ho nam doi dien nhau tren mot duong thang
cau 4,so 2^100 viet trong he thap phan tao thanh 1 so hoi so do co bao nhieu chu so
cau 5,cho a,b,c la so do 3 canh cua mot tam giac vuong voi c la so do canh huyen CMRa^2n+b^2n be hon hoac bang c^2n (n la so tu nhien lon hon 0 )
cho 3 so a,b,c la so nguyen . Trong do co 1 so nguyen am , 1 so nguyen duong va 1 so bang 0 , thoa man IaI=b^2.(b-c) . Hoi a,b,c thuoc loai so nao
moi nguoi giup toi voi........cho ket qua thoi nha
1. gia tri x+y+z biet :
lx-5l+ly-4l+lz-4l=0
2.so cac uoc nguyen duong cu 2^6.3^3
3.so cac uoc nguyen duong cua 18
4.so duong thang tao thanh boi 8 biem phan biet doi mot khong thang hang
5.so tu nhien n thoa man 2^n+1:4^2=1024
6.UCLL(12,18,24)
7.so tu nhien n thoa man 2+4+6.......+n=110
8.tim x 576.15:x=540
9.gia tri a+b+c biet
a+b=10,a+c=25,b+c=25
so phan tu cua tap hop A cac so le nho hon 23
bai 1
cho bieu thuc A = 5/n+1 voi N THUOC Z
a, de A la phan so thi n co dieu kien gi ?
b , tim tat ca cac gia tri nguyen cua n de gia tri A la 1 so nguyen ?
bai 2
cho bieu thuc M = 6/n-3 voi n thuoc Z .Co bao nhieu gia tri cua n de :
a, M ko phai la phan so
b , M la phan so va cp gia tri nguyen ?
bai 3 viet tap hop cacs so nguyen sao cho :
-12/4 < x <6/3
Bài 1:
a: Để A là phân số thì n+1<>0
hay n<>-1
b: Để A là số nguyên thì \(n+1\in\left\{1;-1;5;-5\right\}\)
hay \(n\in\left\{0;-2;4;-6\right\}\)
so cap so nguyen duong a;b thoa man a+2b=11
9+2.1=11
7+2.2=11
5+2.3=11
3+2.4=11
1+2.5=11
Có 5 cặp tất cả
9+2=11
7+2.2=11
5+2.3=11
3+2.4=11
1+2.5=11
=>có 5 cặp thỏa mãn dề bài
cho h la tap hop 3 so le dau tien , k la tap hop 6 so tu nhien dau tien
a viet cac phan tu thuoc k ma ko thuoc m
b chung minh rang h thuoc k
c tap hop m voi h thuoc m , m thuoc k
- hoi m co it nhat baonhieu phan tu ? nhieu nhat bao nhieu phan tu ?
- co bao nhieu tap hop m co 4 phan tu thoa man yeu cau ?
mong moi nguoi giup do minh ?
so cap so nguyen duong (a;b) thoa man a+2b=11 la
cho a, b la cac so nguyen duong thoa man a+ 1 va b+2007 deu chia het cho 6. CmR:4^a +a + b chia het cho 6
GIUP MINH VOI. MINH RAT GAP.CHAC CHAN SE HAU TA SAU (=^.^=)