1) (35*18):7 = (5*7*18):7 = 5*18 = 90
2) (48*13):12 =(4*12*13):12 = 4*13 = 52
3) (99*14):11 = (9*11*14):11 = 9*14 = 126
4) (5*12*70):14 = (5*12*5*14):14 = 25*12 = 300
5) (7*32*45):15 = (7*32*3*15):15) = 21*32 = 672
6) (5*21*54):14 = (5*3*7*2*27):14 = 15*27 = 405