bai toan (x+7)^2-x(x-3)=83 giai giup minh nhe cac ban! c.m cac ban rat nhieu
Phan tich da thuc thanh nhan tu :
a, -x^3 * ( 2x + 1 )^2 + 49x
b, 125x^2 + 20y - 5y^2 - 20
c, ( 1+ 2x )*(1 - 2x ) - x*(x + 2 )*( x - 2 )
d, ( x - z )*(x + z) - y*(2x - y )
e, x^2 - 3x - 54
Giup minh voi nhe cac ban. Minh se tick cho.
giup minh voi
Cho a + b + c = 0 và abc=12. Tính a3 + b3 + c3.
Giup minh voi nha
bai 1giai phuong trinh
a) /x2-5x+5/= -2x2+10x-11
b) 8(x+1/x)2+4(x2+1/x2)-4(x2+1/x2)(x+1/x)2=(x+4)2
bài 2 rut gon a=((b-c)3+(c-a)3+(a-b)3)/((a2(b-c)+b2(c-a)+c2(a-b)
tim x,y 5x-3y=2xy-11
bai 3 cho c2+2(ab-ac-bc)=0, b kac c , a+b kac c
c/m (a2+(a-c)2)/(b2+(b-c)2)=(a-c)/(b-c)
bai 4 cho x>0; y>0 x+y<=4 tim ginn a=x+y+5/x+5/y
ai giai duoc bai nao thi giup mih voi mih xin cam on nhiu!!!!!!!!!
ai co the giup mik baif 3 dc ko ai co long tot nua thif giup mik bai 4
hay chung minh rang voi moi so nguyen a thi (a+2)2-(a-2)2 chia het cho 4
mn giup mik bai 3 nay dc ko aj
a)27^3-72x=0
b)x^2+4x+4=6(x+2)
giup mik nha cac ban