Зная что 1.4<√2<1.5 и 1.7<√3<1.8 оцените числа а)√2+√3 б)√3-√2 с)√6

Дано:
$1.4\ \textless \ \sqrt{2}\ \textless \ 1.5}$
$1.7\ \textless \ \sqrt{3}\ \textless \ 1.8$

а)
$1.4\ \textless \ \sqrt{2}\ \textless \ 1.5}$
+
$1.7\ \textless \ \sqrt{3}\ \textless \ 1.8$
-----------------------------------------
$3.1\ \textless \ \sqrt{2}+ \sqrt{3} \ \textless \ 3.3$

б)
$1.4\ \textless \ \sqrt{2}\ \textless \ 1.5}$
$-1.5\ \textless-\ \sqrt{2}\ \textless \ -1.4$

$-1.5\ \textless-\ \sqrt{2}\ \textless \ -1.4$
+
$1.7\ \textless \ \sqrt{3}\ \textless \ 1.8$
-----------------------------------------
$0.2\ \textless \ - \sqrt{2} + \sqrt{3} \ \textless \ 0.4$

в)
$1.4\ \textless \ \sqrt{2}\ \textless \ 1.5}$
*
$1.7\ \textless \ \sqrt{3}\ \textless \ 1.8$
---------------------------------------
$2.38\ \textless \ \sqrt{6} \ \textless \ 2.7$