Xin giai giup toi giai bai toan sao day, xin cam on nhieu Tim gia tri nho nhat. M= /x-1/ + /y-1/ + /z-1/ Biet /x/ + /y/ + /z/ =5
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ai giup minh giai bai nay voi
1<=z, y, z<=2
tim gia tri lon nhat
A=(x+y+z)(1/x+1/y+1/z)
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...
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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
CMR :
1/1.2 + 1/3.4 + 1/5.6 +.........+ 1/49.50 = 1/26 + 1/27 +.......+ 1/49 + 1/50.
Tim cac gia tri cua x de cac bieu thuc sau day nhan gia tri am :
a) x2 + 5x = A.
b) 3.(2x + 3) . (3x - 5).
Ai biet thi chi giup minh hai bai toan tren nhe ! Xin cam on moi nguoi. (Cang nhan cang tot,hihi)
bai 1:Tim x,y,z \(\varepsilon\)Z ,sao cho :|x-y|+|y-z|+|z-x|+|z-t|+|t-x|=2003
bai 2:Cho bieu thuc:E=\(\frac{5-x}{x-2}\)tim gia tri nguyen cua x de
a) E co gia tri nguyen
b)E co gia tri nho nhat
Cho x;y la hai so duong thay doi. Tim gia tri nho nhat cua bieu thuc:
S=(x+y)^2/x^2+y^2. + (x+y)^2/xy
Giai chi tiet giup mk nha!! Cam on!
Bai 1: Tinh nhanh:a, -69+53+46+(-14)+78 b, 13-12+11+10-9+8-7-6+5-4+3+2-1Bai 2: a,Tim gia tri nho nhat cua bieu thuc: A |x+19|+|y-5|+1890 b, Tim gia tri lon nhat cua bieu thuc: B -|x-7|-|y+13|+1945Bai 3: Tim x,y thuoc Z biet: a, xy-3x -19 b, 3x+4y-xy 16Bai 4: Tim x thuoc Z biet: a, x.(x+3) 0 b, (x-2) (5-x) 0 c, (x+1) (x2+1) 0 d, -12 (x-5)+7 (3-x) 5 e, 30 (x+2)-6 (x-5)-24x 100 f, (x+1)+(x+3)+(x+5)+. . .+(x+99) 0 ...
Đọc tiếp
Bai 1: Tinh nhanh:
a, -69+53+46+(-14)+78 b, 13-12+11+10-9+8-7-6+5-4+3+2-1
Bai 2: a,Tim gia tri nho nhat cua bieu thuc: A= |x+19|+|y-5|+1890
b, Tim gia tri lon nhat cua bieu thuc: B= -|x-7|-|y+13|+1945
Bai 3: Tim x,y thuoc Z biet: a, xy-3x= -19 b, 3x+4y-xy= 16
Bai 4: Tim x thuoc Z biet: a, x.(x+3)= 0 b, (x-2) (5-x)= 0 c, (x+1) (x2+1)= 0
d, -12 (x-5)+7 (3-x)= 5 e, 30 (x+2)-6 (x-5)-24x= 100 f, (x+1)+(x+3)+(x+5)+. . .+(x+99)= 0
Minh xin cam on truoc ! THANK YOU
khó quá mình bó tay
Tim x,y,z biet : ( x - 1/3 ) x ( y - 1/5 ) x ( z + 1/4 ) = 0 va x+y = y - 1 = z+1
giai giup minh nhe minh rat can den day
=> x=1/3 hoặc y=1/5 hoặc z=-1/4 (một trong 3 tích này bằng 0)
x+y=y-1 nên x=y-1-y = -1
Lại có: y-1 = z+1 nên y>x
+ Nếu y = 1/5 thì 1/5-1 = z+1 => -4/5 = z+1 => z = -4/5-1 = -9/5
Thử lại: -1+1/5 = -4/5 = -9/5 + 1
Vậy ta có cặp x,y,z lần lượt là -1;1/5;-9/5
+ Nếu z = -1/4 thì y-1 = -1/4+1 => y-1 = 3/4 => y = 3/4+1 = 7/4
Vậy ta có cặp x,y,z tiếp theo là x=-1 ; y=7/4 ; z=-1/4
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giup wm giai bai toan nay
cho: -1\2=y-2\3=z-3\4 va 2x+y-z=50
tim x,y,z
Tim x biet: 720:(x + 3 + x x 5) =6 giup toi giai bai toan nay voi