Tong cua 1 so tu nhien va 1 so thap phan la 62,42 . Khi cong 2 so do mot ban quen mat dau phay o so thap phan va tinh tong nhu cac so tu nhien duoc tong la 3569 . Tim 2 so do.
khi cong mot so tu nhien voi mot so thap phan , do so xuat mot hang nen ket qua tim duoc la 87,8 . tim mot so thap phan do biet ket qua dung la 51,98. tim so thap phan do ( viet so thap phan duoi dang so thap phan toi gian nhe cac ban nhe ).
mong cac ban giai ho cho minh , minh se tick cho nguoi do O
a , tim cac so tu nhien x y sao cho (2x + 1 ) (y - 5)= 12
b , tim so tu nhien tu nhien sao cho 4n - 5 chia het cho 2n - 1
1.viet so tu nhien nho nhat co tong cac chu so bang 38?
2.mot phep chia hai so tu nhien co thuong la 6 va so du la 33.tim so bi chia,so chia,biet rang tong cua so bi chia,so chia,thuong va so du bang 695.
3.trung binh cong cua 3 so le lien tiep bang 299.tim so lon nhat trong 3 so do?
4.cho phan so a/b.rut gon so phan so a/b ta duoc phan so 5/7.neu them 71 don vi vao tu so va giu nguyen mau so,ta duoc phan so co gia tri bang 18/11.tim phan so a/b?
5.tim y biet:a=(2/11*13+2/13*5+2/15*17+2/17*19+2/19*21)*462-y=19
cac ban giai chi tiet gium minh nhe,ban nao giai duoc minh cho ***** lun
giai giup toi : khi cong 1 so thap phan, mot ban hoc sinh da quen danh dau phay o so thap phan va dat phep tinh cong nhu so tu nhien nen tong la 404. tong dung la 134,72. tim so tu nhien va so thap phan do, biet so tu nhien co 3 chu so va so thap phan co phan nguyen gom 1 chu so ?
tim cac phan so bang 54/72 va co mau so la so tu nhien nho hon22
tin so nguyen n de 4n - 9 / n + 1 la phan so toi gian
tim n so tu nhien n nho nhat de A=5n-7/9 co gia tri duong nho nhat
tim so tu nhien n nho nhat de B=3/7n-27 co gia tri duong lon nhat
sap sep theo thu tu tu be den lon trong cac phan so sau 2 phan 3 , 5phan6 , 7 phan 8 , 1 phan 4 , 5 phan 2
sap sep cac phan so sau theo thu tu tu lon den be trong cac phan so sau
4 phan3 , 10 phan 9 , 7 phan 6 , 5 phan 4 , 9 phan 8
mong cac ban giai cho minh nhe