giup to 3 bai nay 

1. gia tri x lon nhat thoa man : x²(5x-20)=15x

2 gia tri x >0 de -3x⁴+12x²+1 dat gia tri lon nhat

3. tap hop cac gia tri cua x thoa man : x⁴+x³+2x-4=0

1. gia tri x >1 thoa man (9x-7)²=(5-2x)²

2.tong binh phuong tat ca cac gia tri x thoa man : 2(x+5)=x²+5x

3. gia tri cua x³+y³ biet x+y=2 va x²+y²=20

gia tri cua x thoa man

(4x-3).(5x+2)+(10x+7).(1-2x)=12

giup to 2 bai nay

1. gia tri x lon nhat thoa man x²(5x-2)+6=15x

2. gia tri x>0 de -3x⁴+12x²+1 dat gia tri lon nhat 

giup to 2 bai nay

1. gia tri x lon nhat thoa man x²(5x-2)+6=15x

2. gia tri x>0 de -3x⁴+12x²+1 dat gia tri lon nhat 

giup to 2 bai nay

1. gia tri x lon nhat thoa man x²(5x-2)+6=15x

2. gia tri x>0 de -3x⁴+12x²+1 dat gia tri lon nhat 

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)

gia tri cua x > 0 thoa man 3x^2 + 2y^2 = 308 va 5x = 3y

1. gia tri x >0 thoa man x³+x²-8x-8=0

2 gia tri x<0 thoa man 1/27x²-(1/2)³=0