tinh gia tri cua cac da thuc sau biet x+y-2=0.M=x^4+2x^3y-2x^3+x^2y^2-2x^2y-x(x+y)+2x+3
cho A = 4y+9x2-1/2x2-2y
thu gon a roi tim gia tri cua da thuc tai x=-1;y=-1
Tim cac gia tri cua Y de bieu thuc sau nhan gia tri duong
a)2y^2-4y
b)5x(3y+1)x(4y-3)
A=1/3(xy^2)^2.(-1/2x^2y)^2.4/5x^3
B=-2x^4y.1/4x^2y^2.4/5x^3
Thu gon da thuc tren
Xac dinh he so,tim bac cua da thuc vua tim dc
Tinh A+B
va A-B
Bai 2
A=15x^2y-7xy^2+8-y^3+7xy^2+2y^3-12x^2y-1/2
Thu gon da thuc
Tim bac cua da thuc
Tinh gia tri cua da thuc A tai x=-1/2,y=1
tinh gia tri cua bieu thuc sau:
3x^4+5x^2y^2+2y^4+2y^2 biet rang x^2+y^2=1
tinh nhanh gia tri cua bieu thuc voi x,y nhan bat ki gia tri nao:
\(\frac{1}{3}x^2y\left(3xy\right)^2y^4+\frac{1}{2}x\left(-2xy\right)^3y^4+x^4y^7+18\)
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