cho phan so a/b khac 0, toi gian.biet rang neu cong ca tu so va mau so voi tu so cua phan so cua phân so da cho thi duoc phan so moi bang mot nua phan so da cho.khi do gia tri cua hieu a-b la..........................................
cho mot so tu nhien va mot so thap phan co tong bang 2032,11 .Bo dau phay cua so thap phan di thi tong se bang 4023 .Tim so thap phan do.Tra loi: So thap phan do la........
1 lớp duoc thuong 60 phan quà biet so hoc sinh nam gap doi so hoc sinh nu.Tính so hoc sinh nam va hoc sinh nu ( phan qua cua cac ban la nhu nhau )?
giup mình nha minh dang can gap!!!
tim phan so co tong tu so va mau so bang 25 , mau so lon hon tu so 7 don vi
tim so co 3chu so biet rang chu so hang don vi bang 1 phan 5 chu so hang tram va bang 1phan 4 chu so hang chuc .
điền dấu sao bởi số thích hợp
7.*phần *.*=-35 phan 55
chung to phan so sau toi gian
15.n+1 phan 30.n+1
n+1phan 2.n +3
2.n+3 phan 3.n +5
bai 1. 11/3.40/13+37/5:7/33-(11/13.1/3+33/7:5/2)
bai 2.tim x
a,3.(x-1)-5.(-7)=(-2)^3-2x
b,2./(1-x)^2+1/-2^2.3=8
bai 3,cho bieu thuc
M=n+1/n+1 - 3-8n/n+1 + 8/n+1
tim cac gia tri cua n de bieu thuc M co gia tri la so nguyen
bai 4,So hoc sinh cua 1 truong ko qua 1000 em,neuxeptoan bo so hoc sinh cua truong do thanh cac hang,moi hang 20 nguoi thi con thieu 5 nguoi,neu xep moi hang 25 nguoi hoac 30 nguoi thi deu thua 15 nguoi , neu xep 42 hang thi vua du . hoi truong do co bao nhieu hoc sinh
bai 5,cho bieu thuc
A=2+2^2+...+2^200
c/m rang
a, A+2 la 1 luy thua cua 2
b, Achia het cho 30
c,A co phai la so chinh phuong ko ? vi sao ?
bai 6,cho 2 bieu thuc
A=1/1+2 + 1/1+2+3 + ...1/1+2+3+...+99
B=1 + 1/2^2+1/3^2 + ...+1/49^2
c/m rang A<B
1.goi A la tap hop cac so tu nhien co 2 chu so chia het cho 5 .Tong cac phan tu la:
2Gia tri nho nhat cua bieu thuc A=(x^2+2)^2 laBai 1: Tim 3 so nguyen to a, b, c khac nhau sao cho abc < ab + bc + ac
Bai 2: Tim 4 so tu nhien sao cho tong nghich dao cac binh phuong cua chung bang 1.
Moi nguoi trinh bay day du giup minh nhe! (Love)