Помните с номером 140

№ 140

1)
$y= \sqrt{x+3}- \sqrt{7-2x}$

$\left \{ {{x+3 \geq 0} \atop {7-2x \geq 0}} \right.$

$\left \{ {{x \geq-3} \atop {-2x \geq -7}} \right.$

$\left \{ {{x \geq-3} \atop {x \leq 3.5} \right.$

$D(y)=[-3;3.5]$

2)
$y= \sqrt{x-3} + \sqrt{x^2-7x+6}$

$\left \{ {{x-3 \geq 0} \atop {x^2-7x+6 \geq 0}} \right.$

$\left \{ {{x \geq 3} \atop {(x-1)(x-6) \geq 0}} \right.$

+ - +
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$D(y)=[6;+$ ∞ $)$