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a)
![y=frac{1}{x^{2}+x} \
1geq 0 \
x^{2}+xneq 0 \
x(x+1)neq 0\
xneq0 xneq -1](https://tex.z-dn.net/?f=y%3Dfrac%7B1%7D%7Bx%5E%7B2%7D%2Bx%7D+%5C%0A1geq+0+%5C%0Ax%5E%7B2%7D%2Bxneq+0+%5C%0Ax%28x%2B1%29neq+0%5C%0Axneq0++xneq+-1+ "y=frac{1}{x^{2}+x} \
1geq 0 \
x^{2}+xneq 0 \
x(x+1)neq 0\
xneq0 xneq -1")
x=1
a)
![y=frac{x^{2}-4}{sqrt{x-1}} \
x^{2}-4geq 0\
sqrt{x-1}neq 0 \
xgeq +-2 \
xneq 1](https://tex.z-dn.net/?f=y%3Dfrac%7Bx%5E%7B2%7D-4%7D%7Bsqrt%7Bx-1%7D%7D+%5C%0Ax%5E%7B2%7D-4geq+0%5C%0Asqrt%7Bx-1%7Dneq+0+%5C%0Axgeq+%2B-2+%5C%0Axneq+1 "y=frac{x^{2}-4}{sqrt{x-1}} \
x^{2}-4geq 0\
sqrt{x-1}neq 0 \
xgeq +-2 \
xneq 1")
x=[-2;2]
a)
![y=frac{sqrt{20-x-x^{2}}}{4-x^{2}} \
sqrt{20-x-x^{2}}geq 0\
4-x^{2}neq 0\
x^{2}+x-20leq 0\
x_{1}=5 x_{2}=-4 \
xneq 2](https://tex.z-dn.net/?f=y%3Dfrac%7Bsqrt%7B20-x-x%5E%7B2%7D%7D%7D%7B4-x%5E%7B2%7D%7D+%5C%0Asqrt%7B20-x-x%5E%7B2%7D%7Dgeq+0%5C%0A4-x%5E%7B2%7Dneq+0%5C%0Ax%5E%7B2%7D%2Bx-20leq+0%5C%0Ax_%7B1%7D%3D5+x_%7B2%7D%3D-4+%5C%0Axneq+2+ "y=frac{sqrt{20-x-x^{2}}}{4-x^{2}} \
sqrt{20-x-x^{2}}geq 0\
4-x^{2}neq 0\
x^{2}+x-20leq 0\
x_{1}=5 x_{2}=-4 \
xneq 2")
x=[-4;5]
x=1
a)
x=[-2;2]
a)
x=[-4;5]
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