3x=4y-21
<=> x=(4y/3)-7
Thay x=1; x=2; .... x=9
Được 2 nghiệm:
x=1 <=> 8=(4y/3) <=> 24=4y <=>y=6
x=5 <=> 12=(4y/3) <=> 36=4y <=> y=9
Đáp số:
x=1 y=6
x=5 y=9
a, Tim cac so nguyen duong x,y nho hon 10 sao cho 3x - 4y = -21
b, tim cac so nguen x,y sao cho xy -2x + 5y -12 = 0
cho x0 va y0 la cac so nguyen duong thoa man (x-2)(2y+3)=26
Tim cac so nguyen x thoa man (x-7)(x+3) nho hon 0
tim số nguyen duong nho nhat thoa man mot phan 2 so do la so chinh phuong,mot phan 3 so do la luy thua bac 3 cua 1 so nguyen, mot phan 5 so do la luy thua bac 5 cua 1 so nguyen
so nguyen duong x thoa man la ? biet x/9<7/x<x/6
GIUP MIK NHA
Mik se tk cho ai ma giai dung
(nho la giai chi tiet ra nhe)
Giup mk nua nhe
Tim tong cac so nguyen x thoa man : - 20_< X < 15
Cai dau _< la nho hon hoac bang day
hai so nguyen duong x,y co tong la 51
a tim gia tri lon nhat cua x.y
b tim gia tri nho nhat cua tich x,y, biet rang x va y deu lon hon 1
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
so cap x;y nguyen thoa man x>y va x/5=7/y la giup mik nhe mik tik cho !
