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chung minh cac bieu thuc sau khong phu thuoc vao bien
(x+y-z-t)2 - (z+t-x-y)
chung minh rang cac bieu thuc sau khong phu thuoc vao gia tri cua bien x, biet B= x (x^3 + 2x^2 - 3x +2) - (x^2+ 2x) x^2 +3x ( x-1) +x-12
c /m bieu thuc sau khong phu thuoc vao gia tri cua x
(2x+3) (4x^2-6x+9)-2(4x^2-1)
chung minh bieu thuc ko phu thuoc vao gia tri cua bien
A=(2x+5).(4x^2-6x+9)-2(4x.3-1)
B=(x+3)^3-(x+9).(x^2+27)
chung minh bieu thuc sau ko phu thuoc vao x ( 2x + 3) (4x^2 - 6x + 9 ) - 2 ( 4x^3 - 1 )
giai nhanh giup minh voi minh voi
chung to bieu thuc khong phu thuoc vao gia tri cua bien
a)(x-1)(x+1)(x2+1)-(x-2)(x+2)(x2+4)
b)(3x-1)(2x+7)-(x+1)(6x-5)-(18x-12)
chung minh bieu thuc ko phu thuoc vao gia tri bien:
B=(x^2-2)(x^4+2x^2+4)-(x62+2)^3+6x^2(x^2+2)-10
chung minh bieu thuc sau khong phu thuoc va x va y
a ) M = 3x( x - 5y ) + ( y - 5x )( -3y ) - 3(x^2 - y^2 ) - 1
b ) cho S = 1 + x + x^2 + x^3 + x^4 + x^5 cm : xS - S = x^6 - 1
chung minh gia tri cua bieu thuc sau ko phu thuoc vao gia tri cua bien
A=(x+2)(3x-1)-x(3x+3)-2x+7
B=( 2x-3 ) ( 2x+3 )-x( 3+4x )+3x+1
