Các câu hỏi tương tự
choP(x) =ax^ 4-6x^ 3 +7 -2x^ 2-4x^ 4 tim a biet p(x) co bac la 3
tim x, biet 2/7^6x-7=1
tim x, biet
a/ (72 -x)/7 = (x-70) /9
b/ (x-1)/(x+2) = (x-2)/(x+3)
tim x,biet:
a,x+1/3 =3/4
b,-x-2/3=6/7
Tim x biet
a,|x+2|>7
b,|x-1|<3
1)tim x biet rang:
a)3^x-1=1/243
b)2^x+2^x+3=144
c)81^-2x.27x=9^5
2)tim tiep so ghang thu 5 cua day so sau:-1/a^2;2/a^3;-6/a^4;24/a^5;...
3)tim so tu nhien x biet :
a)4^x+4^x+3=4160
b)2^x-1+5.2^x-2=7/32
toan 7 tim x,y,z biet (xy/2y+4x)=(yz/4z+6y)=(zx/6x+2z)=(x^2+y^2+z^2)/2^2+4^2+6^2
cho bieu thuc A=x^2-6x-7 va B=-x^2+2x. tim x khi A+B= 0
tim x biet |x-3|+|x+2|=7