Các câu hỏi tương tự
Tinh tong M:
M = 1/4+ 1/28 + 1/70 +1/130 + ...... ( Biet tong M co 30 so hang )
1) co bao nhieu so co 3 chu so ma ko chia het cho 5
2) tim so hang thu 100 cua day so: 1; 4;9;25;36...
3) tim phan so thu 100 cua day phan so:
1/2; 1/6; 1/12; 1/20; 1/30...
1 ,Tim so co 4 chu so biet chu so hang tram gap doi chu so hang chuc , chu so hang chua gap 3 lan chu so hang don vi
2, Tim 1 so co 2 chu so , biet neu so do chia cho chu so hang don vi cua no thi dc thuong = 6 va du 5
3,Tim so co 4 chu so biet neu xoa chu so hang chuc thi so do giam di 1188 don vi
4, Tim so co 3 chu so neu so do cong voi tong cac chu so cua no thi = 555
Giai Han Ra Nhe !
.
tim a biet a=1/2+1/4+1/8+1/16+....[tong co 10 so hang]
khi xoa chu so hang chuc va hang don vi cua 1 so tu nhien co 4 chu so thi so do giam di 3663 don vi .tim so co 4 chu so do
khi xoa di chu so hang chuc va hang don vi cua 1 so tu nhien co 4 chu so thi so do giam di 4455 don vi . tim so co 4 chu so
khi xoa di chu so hang chuc va hang don vi cua 1 so tu nhien co 4 chu so thi so do giam di 4455 don vi . Tim so co 4 chu so do
Tim 1 so co 3 chu so biet tong 3 chu so la 20,tong 3 chu so gap 4 lan chu so hang tram,chu so hang chuc gap ruoi chu so hang don vi .Tim so do.
A bang 1/2 cong 1/4 cong 1 /8 cong 1/16 ... co 10 so hang hay tim A