Violympic toán 7
Các câu hỏi tương tự
cho ham so y=f(x)=(m-1) ( m khac 1 )
a, xac dinh gia tri cua m de do thi ham so di qua diem A(1;-3).ve do thi ham so vua tim duoc
b,voi ham so tim duoc o cau a,tinh f(2/3), f(-4)
c,diem M(-1;3) va N(6;-9) co thuoc do thi ham so tim duoc o cau a khong?
Tim x,y thuoc Z va x.y,2/x +3/y = 13/x.y -1
6.a) tim 2 so x, ybik 7x=2y va x-y=16
b)so sanh a,b,c bik a/b=b/c=c/a
c)tim cac so a,b,cbik a/2=b/3=c/4 va a+2b-c=-20
d)cho x/2=y/5=z/7 tinh gia tri bieu thuc A=x-y+z/x+2y-z
e)cho 3x-2y/4=2z-4x/3=4y-3z/2.CMR x/2=y/3=z/4
f)cho a,b,c la cac so huu ti khac sao choa+b-c/c=a-b+c/b=-a+b+c/a
tinh gia tri bang so cua 1 bieu thuc m=(a+b)(b+c)(c+a)/abc
g)cho x/a=y/b=z/c CMRbz-cy/a=cx-az/b=ay-bx/c
Cho ham so y=f(x) =12/x
c) tim x de y <0
d) tim x thuoc Z de y nhan GTLN
Cho don thuc A= -xy2 , B=5xy3z, C=5xy2
a, Tim cac so nguyen x de bieu thuc M= \(\dfrac{3}{7-x}\) dat gia tri lon nhat
Tim x de gia tri cua cac bieu thuc sau =0
a. x^3-x^2-4x-4
b. x^3-x^2+2x-2
c. x^3+6x^2+11x+6
tim x,y,z (cau a ) , tim x , y (cau b )
a, x : y : z = 3 : 4 : 5 va 5z2 - 3x2 - 2y2 = 594
b, z + y = x : y = 3.(x - y )
tim x,y thuoc Z biet xy=2(x+y)
tim gia tri cua x de cac bieu thuc sau thuc sau:
A=3x+15
B=2x^2-32 co gia tri bang 0