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6) a)-12-17 + 15 (+59-27-30)-21] = b) +29 E-73 +21 (47+11+32) + 155] = c)-31 [+ 65-37 (61 +26+36)-31]= 7) a)-139 [+ 711-394 (417+ 395 +24)] = b) + 249 E317 (193 +227-35)-2315] = c) + 137 [+ 462-214 (626 + 332 +296)] = ● ● 8) a) + 2 {+ 5 [+28-2 (19 +6+17)]-23} b)-5.{+3 E36 +7 (36+2+35)]-34} = c)-6 7-E18 +3 (+ 13-19 + 8)]-19} = 9) a)-11 {+18 (-15) + 10 [(-12) (+13)-(28 +76).(+89-93)]} = ● b)-15 (+72+ 16 E261-12 (-78 +65)-25 (36+32)]} = c) + 134 101-417 E27 (38) + 19 (43)-211]-739} = ●​