gia tri tuyet doi x /gia tri tuyet doi y=2/3 biet x^2-y^2=5
tim so nguyen x, biet
a. 7 - x = 8 - ( -7 )
b. x - 8 = ( -3 ) = -8
tim so nguyen a, biet
a. gia tri tuyet doi a gia tri tuyet doi = 2
b. gia tri tuyet doi a + 2 gia tri tuyet doi = 0
a, 7-x=8-(-7)
=> 7-x=15
=> x= 7-15
=> x=-8
b, x-8=-3+(-8)
=> x-8=-11
=> x=-11+8
=> x=-3
gia tri tuyet doi cua x-2 +2 . gia tri tuyet doi ua x-y =0
|x-2|+2|x-y|=0
Vì |x-2| \(\ge\) 0 với mọi x
2|x-y| \(\ge\) 0 với mọi x;y
=>|x-2|+2|x-y| \(\ge\) 0 với mọi x;y
Dấu "=" xảy ra
<=>|x-2|=2|x-y|=0
+)|x-2|=0<=>x=2
+)2|x-y|=0<=>x-y=0<=>x=y<=>y=2
Vậy.....................
bai 1 so cac gia tri nguyen cua x de gia tri tuyet doi cua x + gia tri tuyet doi cua x-2 =0
bai 2 so cac gia tri nguyen cua x thoa man gia tri tuyet doi cua x-3 + gia tri tuyet doi cua 8-2x = 1 là
Gia tri tuyet doi cua am x +1 - 2 nhan gia tri tuyet doi cua x-2 -3 nhan gia tri tuyet doi cua am x+3=4
tim tap xac dinh cua ham so
y=3nhan x binh phuong -x tren cho( gia tri tuyet doi cua x binh phuog -x) +(giá tri tuyet doi cua x-1)
y=(can x+2)+(can 3-2x) tren cho (gia tri tuyet doi cua x) -1
gia tri tuyet doi x-42017+gia tri tuyet doi y=0
Tim x : a/ gia tri tuyet doi cua x < 5 b/ 2 be hon hoac bang gia tri tuyet doi cua x < 7
a) \(\left|x\right|< 5.\) Mà GTTĐ của 1 số \(\ge0\)
\(\Rightarrow\left|x\right|\in\left\{0;1;2;3;4\right\}\)
\(\Rightarrow x\in\left\{0;\pm1;\pm2;\pm3;\pm4\right\}\)
b) \(2\le\left|x\right|< 7\)
\(\Rightarrow\left|x\right|\in\left\{2;3;4;5;6;\right\}\)
\(\Rightarrow x\in\left\{\pm2;\pm3;\pm4;\pm5;\pm6\right\}\)
tim gia tri cua x biet !4-!x-3!!=3
luu y:! la gia tri tuyet doi
giá tri tuyet doi cua x+93 + gia tri tuyet doi cua-y+17=0
| x + 93 | + | -y + 17 | = 0
=> x + 93 = 0 và -y + 17 = 0
+) x + 93 = 0 => x = -93
+) -y + 17 = 0 => -y = -17 => y = 17
Vây x = -93, y = 17