Violympic toán 7
Các câu hỏi tương tự
Tim x,y thuoc Z va x.y,2/x +3/y = 13/x.y -1
Cho ham so y=f(x) =12/x
c) tim x de y <0
d) tim x thuoc Z de y nhan GTLN
tim x,y biet:
3lx-2l-lx+1l=x+5
lx-2l+lx+2l=4-y^2 với x,y thuộc Z.
Tim x thuoc Z de A thuoc Z va tim gia tri do .
a/ A= x+3/x-2 .
b/ A= 1-2x/x+3 .
cho x,y ti le thuan tim x biet x2=3,y1=-2,y2=\(\dfrac{3}{8}\) tim x2,y2biet y2-x2=-5,x1=-6,y1=4
Tim x,y biet x^2/9=y^2/16 va x^2+y^2=100
Tim x,y,z biet:
a)\(\left|4-2x\right|+\left|x-2\right|=3-x\)
b)(5x-3)2013=(5x-3)2015
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 )
tinh gia tri bieu thuc:
a,3x^4+5x^2y^2+2y^4+2y^2 biet rang x^2+y^2=1
b,x^3+xy^2-x^2y-y^3+3 biet x-y=0