Gọi số nguyên cần tìm là n , ta có :
\(\frac{-5+n}{9+2n}\) = \(\frac{1}{3}\)
=> ( -5 + n ) x 3 = 9 + 2n
=> -5 x 3 + 3n = 9 + 2n
=> -15 + 3n = 9 + 2n
=> 3n - 2n = 9 - ( -15 )
=> n = 24
k nha
Cho phân số -5/9
a) hoi phai cong them vao mau va bot di vao tu cho cung mot so nao e duoc phan so moi co gia ri bang phanso -7/12
b) hay tim mot so nao sao cho khi cong so do vao tu hthem vao mau hai lan so do thi duoc phan so co gia tri bang 1/3
1.Cho so N la so co hai chu so chia het cho 3.Neu viet xen so 0 vao giua hai chu so do roi cong no voi hai lan chu so hang chuc cua so N ta duoc so moi gap 9 lan so N.Tim so do
2.Tong hai so thap phan la 60,1.Neu dich dau phay cua so nho sang ben phai mot hang roi dem tru di so lon thi ta duoc 219,52.Tim hai so do.
3.Tim so co hai chu so biet neu ta them so 33 vao giua hai chu so do thi duoc mot so moi gap so phai tim 89 lan.
cho so 65
a, hay viet them 2 chu so vao beb phai so 65 de dc so moi be nhat co 4 chu so cung chi het cho ca 3 va 5. so moi do la so nao?
b, Hay viet them 2 chu so vao ban trai so 65 de dc so moi lon nhat co 4 chu so cung chia het cho 5 va 9. so moi do la so nao?
Giup minh can gap , ai nhanh minh tick lun
nho viet ro loi giai nhe
Cho phan so 31/41 hay tim so tu nhien x sao cho khi bot x o tu va them x vao mau ta duoc phan so moi =2/3
tim so tu nhien co 3 chu so biet rang neu viet them chu so 1 vao truoc so do thi dc so moi gap 9 lan so ban dau
hieu 2 so la 134. Neu them 1 c / s nao do vao ben phai SBT , giu nguyen ST thi co hieu moi la 2297. tim 2 so do
Tim so co 3 chu so biet rang neu viet them vao chu so 1 vao truoc so do thi duoc so moi gap 9 lan so ban dau .So can tim la
Tim phan so toi gian a/b biet :
a) Cong tu voi 4, cong mau voi 10 thi gia tri phan so ko doi
b) Cong mau vao tu, cong mau vao mau cua phan so thi duoc phan so moi bang 2 lan phan so da cho.
Tim so tu nhien co 2 chu so biet neu viet them chu so 1 vao ben phai so do ta duoc tong so moi va so do la 980 .
