So sánh : A = \(\left(2008^{2007}+2007^{2007}\right)^{2007}\)
B = \(\left(2008^{2008}+2007^{2008}\right)^{2007}\)
1.Tìm x,y
a)\(\left|x\right|\)=2017
b)\(\left|x\right|\)=\(\left|2017\right|\)
c)\(\left|x\right|\)+\(\left|y\right|\)=0
d)\(\left|x+5\right|\)+\(\left|y-3\right|\)=0
f)\(\left|x+2\right|\)=\(-5\)
Tìm x;y \(\in\) Z
\(\left|3x+2y\right|\) +\(\left|4y-1\right|\) \(\le\) 0
\(\left|x+y-7\right|\) \(\left|xy-10\right|\) \(\le\) 0
\(\left|x-y-2\right|\) +\(\left|y+3\right|\) =0
Bài 1: Tìm x, y biết :
\(\left|x+123\right|+|\left|y+1\right|-5|=0\)
1)tìm x\(\in\)Q biết:
a)\(\left(5\cdot x+1\right)^2=\dfrac{36}{49}\)
2)tìm x,y biết:
a)\(x^2+\left(y-\dfrac{1}{10}\right)^4=0\)
b)\(\left(\dfrac{1}{2}x-5\right)^{20}+\left(y^2-\dfrac{1}{4}\right)^{40}\le0\)
Tìm x;y \(\in\) Z
\(\left|3x-4\right|\) +\(\left|3y+5\right|\) =0
Bài 1: Phá dấu ngoặc rồi tính:
a)\(\left(a+b+c\right)-\left(a-b+c\right)\)
b)\(\left(4.x+5.y\right)-\left(5.x-4.y-1\right)\)
Bài 2: Chứng minh bất đẳng thức:
a)\(\left(a+b+c+d\right)-\left(a-b-c+d\right)+1=a-\left(a-2b-2c-d\right)+\left(d+1\right)\)
b)\(\left(4x-3y+2\right)-\left(3x-4y+2\right)=\left(2x+2y\right)-\left(x+y\right)\)
1) Tìm x;y thuộc Z thỏa :
\(\left(x-2\right)^2+\left(y+16\right)^{2016}=0\)
\(\left|x-4\right|^{2017}+\left|y\right|=0\)
tìm gtri của x