Find the value 37+(-21)-26+15-(-2)+(-9).
Simplify the following
1)11-[7-{5-3(9-(3-6))}]
2)16-[5-2+{7of2-(6÷3×2-1+3)}]
Simplify: 7√3√10+√3−2√5√6+√5−3√2√15+3√2.