\(A=x^2y-x^3-3xyz-4+3xyz+1=x^2y-x^3-3\)
\(=\dfrac{1}{4}\cdot4-\left(-\dfrac{1}{8}\right)-3\)
=1-3+1/8
=-2+1/8=-15/8
\(A=x^2y-x^3-3xyz-4+3xyz+1=x^2y-x^3-3\)
\(=\dfrac{1}{4}\cdot4-\left(-\dfrac{1}{8}\right)-3\)
=1-3+1/8
=-2+1/8=-15/8
tinh gia tri bieu thuc A tai x=\(\dfrac{-1}{2}\);y=4;z=6
A=x\(^2\)y+(-x\(^3\)-3xyz)-(4-3xyz)+(-14\(^{15}\))\(^0\)
tinh gia tri bieu thuc A tai x=\(\dfrac{-1}{2}\);y=4;z=6
A=x\(^2\)y+(-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
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
tinh gia tri bieu thuc:
a,3x^4+5x^2y^2+2y^4+2y^2 biet rang x^2+y^2=1
tinh gia tri bieu thuc:
a,3x^4+5x^2y^2+2y^4+2y^2 biet rang x^2+y^2=1
tinh gia tri bieu thuc:
a,3x^4+5x^2y^2+2y^4+2y^2 biet rang x^2+y^2=1
tinh gia tri cac bieu thuc sau:3x^4+5x^2y^2+2y^4+2y^2biet rang x^2+y^2=1
tinh gia tri cua bieu thuc:
3x^4+5x^2y^2+2y^4+2y^2 biet rang x^2+y^2=1