Các câu hỏi tương tự
Cho A = 1/1.2 + 1/3.4 + 1/5.6 +.......+ 1/49.50.
B = 1 + 1/2 + 1/3 + 1/4 +........+ 1/49 + 1/50.
C = 1/2 + 1/4 + 1/6 +.........+ 1/48 + 1/50.
CMR A = B - 2C.
Minh dang can gap. Ai biet thi chi giup minh nhe ! Cam on moi nguoi nhieu lam.
tim cac gia tri nguyen x sao cho bieu thuc p=2x-1/2x+1 nhan gia tri nguyen
bai 1. 11/3.40/13+37/5:7/33-(11/13.1/3+33/7:5/2)bai 2.tim xa,3.(x-1)-5.(-7)(-2)^3-2xb,2./(1-x)^2+1/-2^2.38bai 3,cho bieu thuc Mn+1/n+1 - 3-8n/n+1 + 8/n+1tim cac gia tri cua n de bieu thuc M co gia tri nguyenbai 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 A2+...
Đọc tiếp
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
Tinh gia tri cac bieu thuc sau
a) A = \(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{49.50}\)
Cac ban giup minh 5 bai toan nay nhe , minh dang can gap!1/ An va Binh moi nguoi mua mot so hop but chi mau , trong moi hop deu co tu ba but tro len va so but o cac hop deu bang nhau. Tinh ra An mua 20 but , Binh mua 15 but. Hoi moi hop but chi mau co bao nhieu chiec va moi ban da mua bao nheu hop but chi mau ?2/ a) Tim x thuoc N, biet x chia het cho 25 va 45 va 300 x 500 b) Tim x thuoc Z, biet gia tri tuyet doi cua x - (- 15) 603/ ( Bai toan thuc te )Mot nha kinh doanh nam dau tien lai 20...
Đọc tiếp
Cac ban giup minh 5 bai toan nay nhe , minh dang can gap!
1/ An va Binh moi nguoi mua mot so hop but chi mau , trong moi hop deu co tu ba but tro len va so but o cac hop deu bang nhau. Tinh ra An mua 20 but , Binh mua 15 but. Hoi moi hop but chi mau co bao nhieu chiec va moi ban da mua bao nheu hop but chi mau ?
2/ a) Tim x thuoc N, biet x chia het cho 25 va 45 va 300 < x < 500
b) Tim x thuoc Z, biet gia tri tuyet doi cua x - (- 15) = 60
3/ ( Bai toan thuc te )
Mot nha kinh doanh nam dau tien lai 20 trieu dong, nam thu 2 lo 43 trieu dong, nam thu 3 lai 65 trieu dong. Hoi so von cua nha kinh doanh tang bao nhieu trieu dong sau 3 nam kinh doanh.
4/ Tren tia Ax lay hai diem B va C sao cho AB = 3 cm ; AC = 9cm
a) Tinh BC
b) Tren tia doi cua tia Ax lay diem M sao cho AM = 3 cm . Tinh MB
c) Goi K la trung diem BC so sanh cac doan thang BK va AM.
5/ Tim so tu nhien n sao cho 2n + 5 chia cho n + 1.
Cac ban hay giup minh nha!
tim cac dang cua x sao cho
bieu thuc A = 2x-1 co gia tri duong x
bieu thuc B = 8-2x co gia tri am
bieu thuc C=2(x+3) khong am
bieu thuc D=7(2-x)khong duong
tim cac gia tri nguyen cua x de y nhan gia tri nguyen,biet :y=5x+9/x+3
Cau1.Hay tinh hop li cac tong sau daya) A1/3+1/3^2+1/3^3+....+1/3^100b)B10/56+10/140+10/260+....+10/1400Cau2Cho C2+2^2+2+3+...+2^99+2^100a)Tinh tong Cb)Tim x de2^2x-1-2C c)Chung minh rang C chia het ch 31Cau 3a) So sanh: A2005^2005+1/2005^2006+1 va B2005^2004+1/2005^2005+1b)Tim so nguyen m sao cho so m+6/m-1 la so nguyenCau4Cho ABx(cm) AC7(cm) BC2x-1(cm) .Timx sao cho ba diem A B C thang hangCau 5a) Tim x,y thuoc N biet 2^x+6245^yb)Voi gia tri nao cua x ,y thi bieu thuc A/x-y/+/x+1/+2013...
Đọc tiếp
Cau1.Hay tinh hop li cac tong sau day
a) A=1/3+1/3^2+1/3^3+....+1/3^100
b)B=10/56+10/140+10/260+....+10/1400
Cau2
Cho C=2+2^2+2+3+...+2^99+2^100
a)Tinh tong C
b)Tim x de2^2x-1-2=C
c)Chung minh rang C chia het ch 31
Cau 3
a) So sanh: A=2005^2005+1/2005^2006+1 va B=2005^2004+1/2005^2005+1
b)Tim so nguyen m sao cho so m+6/m-1 la so nguyen
Cau4
Cho AB=x(cm) AC=7(cm) BC=2x-1(cm) .Timx sao cho ba diem A B C thang hang
Cau 5
a) Tim x,y thuoc N biet 2^x+624=5^y
b)Voi gia tri nao cua x ,y thi bieu thuc A=/x-y/+/x+1/+2013 dat gia tri nho nhat .Tim gia tri nho nhat do
Chu y dau ''/'' la dau gia tri tuyet doi
Cau 6
De chuan bi cho ki thi hoc sinh gioi, mot hoc sinh giai 35 bai toan.Biet rang cu moi bai dat loai gioi duoc thuong 20 diem moi bai dat loai kha trung binh duoc thuong 5 diem . Con moi bai yeu, kem bi tru 10. Lam xong 35 bai em do duoc thuong 130 diem .Hoi co bao nhieu bai loai gioi ,bao nhieu bai loaiyeu ,kem .Biet rang co8 bai kha va trung binh
Ai lam dung minh tich cho
Nho giai ra nha
bai 1 tim nguyen de cac bieu thuc sau dat gia tri lon nhat
P=2010-(x+1)^2008
Q=1010-/3x/
C=5 phần (x-3)^2+1
D=4 phần/x-2/+2