\(a,79,45-31,69-15,76=\left(79,45-15,76\right)-31,69=63,69-31,69=32\)
\(b,8,4:4+11,6:4=\left(8,4+11,6\right):4=20:4=5\)
a) 79,45 - 31,69 - 15,76 b) 8,4 : 4 + 11,6 : 4
= ( 79,45 - 15,76 ) - 31,69 = ( 8,4 + 11,6 ) : 4
= 63,69 - 31,69 = 20 : 4
= 32 = 5