a) |11| =11 hoac |-11|=11
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Các câu hỏi tương tự
Tìm x \(\in Z\)
a,\(\left|2x-1\right|=\left|x+3\right|\)
b,\(\left(x^2-1\right)\left(x^2-20\right)\le0\)
c, \(\left(x+1\right)+\left(x+3\right)+\left(x+5\right)+...+\left(x+2015\right)=0\)
d, \(\left(x-3\right)+\left(x-2\right)+\left(x-1\right)+...+10+11=11\)
Chứng minh đẳng thức:
a) \(\left(a+b\right)\left(c+d\right)-\left(a+d\right)\left(b+c\right)=\left(a-c\right)\left(d-b\right)\)
b) \(\left(a-c\right)\left(b+d\right)-\left(a-d\right)\left(b+c\right)=\left(a+b\right)\left(d-c\right)\)
Chứng minh đẳng thứca) left(x-yright)-left(x-zright)left(z+xright)-left(y+xright)b) left(x-y+zright)-left(y+z-xright)-left(x-yright)left(z-yright)-left(z-xright)c) aleft(b+cright)-bleft(a-cright)left(a+bright)cd) aleft(b-cright)-aleft(b+dright)-aleft(c+dright)e) left(a+bright)left(c+dright)-left(a+dright)left(b+cright)left(a-cright)left(d-bright)f) left(a-cright)left(b+dright)-left(a-dright)left(b+cright)left(a+bright)left(d-cright)
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Chứng minh đẳng thức
a) \(\left(x-y\right)-\left(x-z\right)=\left(z+x\right)-\left(y+x\right)\)
b) \(\left(x-y+z\right)-\left(y+z-x\right)-\left(x-y\right)=\left(z-y\right)-\left(z-x\right)\)
c) \(a\left(b+c\right)-b\left(a-c\right)=\left(a+b\right)c\)
d) \(a\left(b-c\right)-a\left(b+d\right)=-a\left(c+d\right)\)
e) \(\left(a+b\right)\left(c+d\right)-\left(a+d\right)\left(b+c\right)=\left(a-c\right)\left(d-b\right)\)
f) \(\left(a-c\right)\left(b+d\right)-\left(a-d\right)\left(b+c\right)=\left(a+b\right)\left(d-c\right)\)
a)\(2\dfrac{3}{3}.4.\left(-0,4\right)+1\dfrac{3}{5}.1,75+\left(-7,2\right):\dfrac{9}{11}\)
b)\(\left(\dfrac{1}{24}-\dfrac{5}{16}\right):\dfrac{-3}{8}+1^{10}.\left(-5\right)^0\)
CMR
\(a,\left(a-b\right)+\left(c-d\right)=\left(a+c\right)-\left(b+d\right)\)
\(b,\left(a-b\right)-\left(c-d\right)=\left(a+d\right)-\left(b+c\right)\)
nếu 0<a<b<c<d<<e<f và \(\left(a-b\right)\left(c-d\right)\left(e-f\right)x=\left(b-a\right)\left(d-c\right)\left(f-e\right)\)thì x=..........
Chứng minh đẳng thức
\(\left(a-c\right)\left(b+d\right)-\left(a-d\right)\left(b+c\right)=\left(a+b\right)\left(d-c\right)\)
Tìm x \(\in\)Z ,biết:
a,\(\left(x+1\right)+\left(x+3\right)+...+\left(x+99\right)=0\)
b,\(\left(x-3\right)+\left(x-2\right)+\left(x-1\right)+...+10+11=11\)
Tìm các số nguyên x thỏa mãn :a, left(x-2right)left(x-7right) 0b, left(x^2-3right)left(x^2-10right) 0c, left(x^2-1right)left(x^2-4right)left(x^2-7right)left(x^2-10right) 0d, left(x^3+5right)left(x^3+10right)left(x^3+15right)left(x^3+30right) 0
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Tìm các số nguyên x thỏa mãn :
a, \(\left(x-2\right)\left(x-7\right)< 0\)
b, \(\left(x^2-3\right)\left(x^2-10\right)< 0\)
c, \(\left(x^2-1\right)\left(x^2-4\right)\left(x^2-7\right)\left(x^2-10\right)< 0\)
d, \(\left(x^3+5\right)\left(x^3+10\right)\left(x^3+15\right)\left(x^3+30\right)< 0\)