A=1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512+1/1024
A=1/1*2+1/4*2+1/8*2+1/16*2+1/32*2+1/64*2+1/128*2+1/256*2+1/512*2
A*2=1+(1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512)-1/1024
A*2-A=511/512+1/1024
A=1023/1024
o 1 nha may co 3 to cong nhan neu lay 20% so cong nhan o to 1 chia deu cho 2 to con lai tyhi so cong nhan o 3 to bang nhau neu to 1 co them 8 cong nhan thi so cong nhan cua to 1 bang tong so cong nhan cua 2 to kia hoi to 1 co ? cong nhan
cho 2 so 59 va 19 . Hay tim 1 so a sao cho dem moi so cong them a thi 2 so co thuong bang 3
1. Tim trung binh cong cua tat ca cac so tu nhien co 4 chu so khac nhau duoc viet boi bon chu so 0;3;5;7.Trung binh cong cua tat ca cac so do la?
2 .Tong cua 3 so bang 5,2. So thu nhat bang 2/3 so thu ba va so thu hai bang 50% so thu ba. Tim so thu hai?
3. Tim mot phan so co mau so bang 25 , biet rang neu cong tu so voi 34 va nhan mau so voi 3 thi duoc phan so moi bang phan so da cho. Tim phan so do?
4. Tim mot phan so biet rang neu cong them 4 vao tu so va giu nguyen mau so thi ta duoc phan so moi bang 1, con neu giu nguyen tu so va cong them 3 thi ta duoc phan so moi bang 1/2 .Tim phan so do?
5. Hay cho biet co tat ca bao nhieu so co 3 chu so ma tong co chu so cua moi so bang 4 . co tat ca bao nhieu so thoa man?
khi cong hai so thap phan , ban A da viet nham dau phay cua mot so hang sang ben phaimot chu so nen co ket qua la 692,22 . Em hay tim 2 so da cho biet tong cua chung bang 100,56
cac ban giai theo cach lam cap 1 nha
2 so thap phan co hieu bang 8,35. neu doi dau phay cua so lon sang trai 1 hang roi cong voi so be ta duoc 14,85. tim 2 so do ?
2 so thap phan co hieu bang 8,35. neu doi dau phay cua so lon sang trai 1 hang roi cong voi so be ta duoc 14,85. tim 2 so do ?
to 1 co 16 cong nhan chuyen duoc 32 tan hang vao kho trong 2 gio hoi to 2 co 8 cong nhan thi chuyen duc bao nhieu tan hang vao kho trong 8 gio
mot to cong nhan co so nu bang 1/3 so nam.sau theo cong viec nen da thay doi 3 cong nhan nam bang 3 cong nhan nu . vi vay so cong nhan nu bang 2/3 so nam . hoi co bao nhieu cong nhan
tich cua 2 so A va B la mot so co hai chu so chia het cho 2 va 3 va chia 5 du 1,chu so hang chuc nho hon chu so hang don vi .khi cong hai don vi vao A va 4 don vi vao B thi ta co tich moi la 98. hay tim A va B.
