C=x2+10x+26
=x2+2.x.5+52+1
=(x+5)2+1
thay x=45:
= (45+5)2+1
=502+1
=2500+1
=2501
C=x2+10x+26
=x2+2.x.5+52+1
=(x+5)2+1
thay x=45:
= (45+5)2+1
=502+1
=2500+1
=2501
Tinh gia tri bieu thuc
A=x2-4y2+x-2y
cho x,y khac nhau biet x2-y=y2-x. tinh gia tri cua bieu thuc A=x2+2xy+y2-3x-3y
tinh gia tri cua bieu thuc
a, x^3+12x^2+48X+64 tai x=6
B, x^3-6X^2+12x-8 tai x=22
tinh gia tri nho nhat x^2-10x+26
cho x+y =1 . tinh gia tri cua bieu thuc A=x^3+y^3+3xy
chox-y=1. tinh gia tri cua bieu thuc B=x^3-y^3-3xy
cho x+y=1 . tinh gia tri cua bieu thuc C=x^3+y^3+3xy(x^2+y^2)+6x^2*y^2(x+y)
Thuc hien phep nhan rut gon roi tinh gia tri bieu thuc
B)x(x^2-y)-x^2(x+y)+y(x^2-x) tai x=1/2 va y=-100
1) Tinh gia tri bieu thuc:
C= \(\frac{5x^2+3y^2}{10x^2-3y^2}\)voi \(\frac{x}{3}=\frac{y}{5}\)
tinh gia tri bieu thuc sau
\(x^3-3x^2+3x-1\) tai x=101
\(x^3+9x^2+27x+27\)tai x=97
giup to hai bai nay
1. gia tri X thoa man 4x*(5x-1)+10x*(2-2x)=16
gia tri x thoa man (x^2+1)*(x^2+5)
2. tinh gia tri bieu thuc A
A=(202+182+162+...+42+22)-(192+172+152+...+32+12)