Violympic toán 7
Các câu hỏi tương tự
Tim gia tri nho nhat cua bieu thuc:
a, A= 2|3x - 2 | - 1
b, B= 5|1 - 4x | - 1
c, C = x2+ 3|y-2| - 1
d, D = x + |x|
e, E = | x - 7 | + 6 - x
tim gia tri cua bieu thuc X=2x^5-5y^3+2015 tai x,y thoa man /x-1/=(y+2)^20=0
tinh gia tri bieu thuc A tai x=-1/2; y=4;z=6
A=x^2y+(-x^3-3xyz)-(4-3xyz)+(-14^15)^0
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
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
tap hop cac gia tri nguyen x cua bieu thuc /2x + 2,5/+/2x -3/ dat gia tri lon nhat
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 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 cac gia tri cua x de bieu thuc sau co gia tri bang 0:
P(x)=2x-7+(x-14)
Q(x)=x^2-64