\(P=\text{|}x+1\text{|}+\text{|}2x+3\text{|}+\text{|}3x+5\text{|}\ge0.\)( trị tuyệt đối luôn lớn hơn hoặc = 0 )
Mà \(P=16x-1\)
\(\Rightarrow16x-1\ge0\)
\(\Rightarrow x\ge\frac{1}{16}\) \(\Rightarrow x>0\)
phá trị tuyệt đối với x>0 ta được
\(x+1+2x+3+3x+5=16x-1\)
\(6x+9=16x-1\)
\(6x-16x=-1-9\)
\(-10x=-10\)
\(x=\frac{-10}{-10}=1\) ( tm x>0 )
Cap so (x;y) nao thoa man dang thuc sau: 3^2x+1.7^y=9.21^x
Cac ban giup mk voi!!! Mai phai nop oi!!!!!!!!
a) tim gia tri nho nhat cua bieu thuc
A= | 2x-2 | + | 2x-2019 |
b) tim x lon nhat thoa man
| 2x-4 | - | 6-3x | = -1
cho x thoa man dang thuc 3/4+1/4/x=2/5.vay 7x=
giup minh voi
cap so x,y nao thoa man dang thuc: 3^2x+1.2^y=9.21^x
GIUP MIK NHA !! <3<3
tim cac da thuc dong dang 5/3x^2y, (xy^2), 2xy^2, 2x^2y, 1/4xy^2, x^2y, x^2y, -1/2x^2y, -2/5x^2y, -4xy^2
Bai 1 : Tinh gia tri cac bieu thuc
a) x2 + 10x + 26 vs x=45
b) x2 - 0,2x + 0,01 vs x= 1,1
Bai 2: Tim x
a) (2x - 5)2 - (4x - 1) . (x + 3) = 5
b) (3x + 4 )2 - (3x - 1) . (3x + 1)= 2
giup mk, mk tick cho !! camon m.n nhieu@@
1) (3x-5/9) mu 200 + (3y+0,4/3) mu 2008 =0
tim cap x;y thoa man
2) (2x-1) mu 2k + (y-(1/3))mu 4k = 0
ai truoc thi mk like
co bao nhieu cap so (x;y) thoa man dang thuc 3xy+x-1= 1
Cho bieu thuc :
C = ( 1 - 3x ) . x - 2x . ( x - 1 ) + 8
a ) Thu gon C
b ) Tinh gia tri bieu thuc voi x = -3
c ) Tim x de C = 8
d ) Tim ngiem cua C
dau . la dau nhan nha cac bn
nhanh nhanh nha mk dang can gap
