Để 12x là nguyên tố => x = 7
Để 36x nguyên tố => x = 7
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thay cac dau * boi cac chu so thich hop de:*1994* chia het cho 99
a, phan tich so 111 ra thua so nguyen to roi tim tap hop cac uoc cua 111.
b, thay dau * boi chu so thich hop:
** . * =111
thay chu a va dau * boi chu so thich hop de aaa x a = ***a
cac chu so o dau * ko nhat thiet phai bang nhau
133
a.phan tich so 111 ra thua so nguyen to roi tim tap hop cac uoc cua 111
b.thay dau * boi chu so thich hop:
**.*=111
cho cac so nguen : a = 10 , b = -18
a) viet tap hop cac uoc cua a , cac uoc cua b
b) viet tap hop cac so nguyen vua la uoc cua a vua la uoc cua b
c) viet tap hop cac so nguyen vua la boi cua a vua la boi cua b
cac dau *va cac chu boi cac chu so thich hop
a,*8*3x9=70*7*
tap hop cac so nguyen x thoa man (x-1).(x+5):(x-1).(2x+6)=1(dau : la de thay cho phan so )
tap hop cac so nguyen duong nho hon 8 la (...) nhap cac gia tri theo thu tu tang dan ,ngan cach boi dau ;
Thay cac dau * bang cac chu so thich hop de co mot phep tinh dung:
***-**=1
****-***=1