1+[-3]+5+[-7]+...+97+[-99]+101
=(1+5+9+...+97+101)+[(-3)+(-7)+...+(-99)]
=1326+(-1275)
=51
1+[-3]+5+[-7]+...+97+[-99]+101
=(1+5+9+...+97+101)+[(-3)+(-7)+...+(-99)]
=1326+(-1275)
=51
tinh gia tri bieu thuc:
1+[-3]+5+[-7]+...+97+[-99]+101
[GIAI CHI TIET HO MINH NHA DANG CAN GAP MINH CAM ON NHIEU ]
bai 1
cho tong : S = 5 + 8 + 11 +14 = ....
a) tim so hang thu 100 cua tong
b) tinh tong 100 so hang dau tien
bai 2
cho tong : S = 7 + 12 + 17 + 22 + .......
a) tim so hang thu 50 cua tong
b) tinh tong 50 so hang dau tien
bai 3
tinh tong cua tat ca cac so hang tu nhien x , biet x la so tu nhien co 2 chu so va 12 < x <91
ban nao lam ho minh 3 bai tren voi ma ban nao nao lam ra dau tien minh se tich ngay va lun
Ti so cua 2 so la 7/12 , them 10 vao so thu nhat thi ti so cua chung la 3/4 . Tong 2 so la ? ( giai chi tiet nha )
hai ban Bac va Trung cos mot so quyen sach biet rang so sach cua bac bang 3/5 tong so sach cua hai ban so sach cua trung bang 1/2 tong so sach hai ban va bac va bac co nhieu hon trung 5 quyen HOI:
A)CA HAI BAN CO BAO NHIEU QUYEN SACH
B)MOI BAN CO BAO NHIEU QUYEN
P/S:NHO GIAI CHI TIET NHE
S= 2+2^2+2^3+.....+2^2018
tinh tong , giai chi tiet
ai giai truoc minh tick cho nhe
Trong 1 phep tinh so bi chia bang 98 so du bang 3 . Tim so chia va thuong
giai chi tiet nhe ! ai nhanh nhat minh like 3 luon .
Tong cua 5 so nguyen to la 198. Tim so nguyen to nho nhat trong 5 so do?
GIAI CHI TIET NHA, MIK TICK CHO
1.tim 2 so tu nhien co hieu bang 2002 va tich bang 2006.
2.cho 100 so tu nhien 1,2,3,4,....100.
co the chon duoc 71 so tu nhien sao cho tong cua chung bang tong cua 29 so con lai khong
3.mot so chan co 4 chu so , trong do so tao boi chu so hang tram va hang chuc gap 3 lan chu so hang nghin va gap 2 lan chu so hang don vi .
[CAC BAN GHI LOI GIAI GIUP MINH NHE MINH CAM ON]
bai 1 : hoc sinh khoi 6 cua truong khi xep hang 2 , 3 , 4 , 5 , 6 deu thua 1 em nhung khi xep hang 7 thi vua du . biet rang so hoc sinh khoi 6 it hon 350 . tinh so hoc sinh khoi 6
cac cau lam gi giai ro rang chi tiet nah cac cau ai nhanh nhat thi mink se tick cho nguoi do nha