5. Oblicz w pamięci: a) 36 +21 = b) 25+ 37 18 +34 = 27 +52 = c) 85 +23 92 +35 = 67 +58 = 73 + 49 = 48 +32 = 26 + 47 = 17 +53 = 39 +49 -​