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 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 + ...+1/29^2

c/m rang A<B

ai co the giup bai nao thi noi luon cach giai nhe

le len may bn

(Toán cổ) 1 ba mang 1 ro trung ra cho ban doc duong gap 1 ba khac vo y dung phai ro trung roi xuong dat ba kia to y muon den lai so trung ben hoi : ba cho biet trong ro co bao nhieu trung

ba co ro chung tra loi: toi chi nho rang so trung do chia cho 2 cho 3 cho 4 cho 5 cho 6 lan nao cung con thuc ra 1 qua nhung chia cho 7 thi ko thua qua nao a ma so trung chua  den 400 qua tinh xem trong ro co bao nhieu trung

 mong các bn trả lời đầy đủ mk sẽ tick nếu ko đầy đủ sẽ ko tick

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

Bai 1 : Lop 6A co 25% so hoc sinh dat loai gioi , \(\frac{2}{3}\)so hoc sinh dat loai kha va 3 hoc sinh dat loai trung binh ( ko co hoc sinh yeu kem ) . Hoi lop 6A :

       a) Co bao nhieu hoc sinh ?

       b) Co bao nhieu hoc sinh dat loai gioi , bao nhieu hoc sinh dat loai kha ?

Bai 2 : Thuc hien phep tinh :

a) \(\frac{-5}{2}:\left\{\frac{3}{4}-\frac{1}{2}\right\}\)b, \(\left\{\frac{-5}{24}+0,75+\frac{7}{12}\right\}:\left\{-2\frac{1}{4}\right\}^2\)c, \(11\frac{3}{13}-\left\{2\frac{4}{7}+5\frac{3}{13}\right\}\)