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f.1+3+5+7+......+999
So so hang la:
[999-1]:2+1=500
Tong la:
[1+999].500:2=250000
m.3+7+11+15+...+99
So so hang la:
[3+99].25:2=1275
tinh gia tri cua bieu thuc
(24.52.112.7):(23.53.72.11)
giup minh voi
ai nhanh minh tich nha
cam on cac ban nhieu
a) 92/9 + 13/5 - 56/9
b) 58/7 - (31/9 + 30/7)
c) 2/3 + 1/3 x 9/4 - 13/12
d) 41/8 - 7/4 : 11/5
e) 478/19 : 5/4 - 668/19 : 5/4
f) 32/21 x 49/45 : 16/22 x 15/33
g) 2020x2018+9 / 2019x2020-2011.
Giup minh voi minh dang can gap!!!
1/3+5/8-7/12
giup minh nhe roi ket ban voi to luon nhe
a/(2n+13)chia het cho 2n+5
b/7 chia het cho 11-2n
c/3n+7 chia het cho 4n+3
Cac ban giup mk voi,mk tik cho nha!!
Giup minh voi cac ban
1+2-3-4+5+6-7-8+.....+994-995-996+997+998
bai 1:tim x
a,(27.x+6):3-11=9
b,(15-6x).35=36
c,(2x-6).47=49
giup minh voi !!!!!!!!!
Cac ban giai giup minh bai nay voi
a 1+(-3)+2+(-4)+3+(-5)+...+98+(-100)
b 1+(-5)+2+(-6)+3+(-7)+...+99+(-103)
mn giup minh nha
tinh nhanh
a, 35.34+35.86+65.75+65.45
b, 10+11+12+13+........+ 99
c,(1+3+5+7+....+2017).(135135.137 + 135.137137)
cam cac ban da giup minh
1+(-6)+2+(-7)+3+(-8)+...+15+(-20)
Giup mk voi, Mk cam on cac ban nhieu