n) 54 x 10+ [(780:4+ 76 x 10): 5+ 343]:6 o) [29+ 3 x 9-13:13-50: (7 + 3)]: (9-6:3+43) = p) 981:3- [164+ (248:8 +4 x 39+117:9):10] = q) 10 × [64 × 11 - 12 + (44 : 4 + 30:5) x 2 + 132:4]-25 x 4 = r) (24:3+ 15x2+9:3+3): [(72:4+6 x 12)-15x4-8] = s) 520:10+ [770:7- (835:5-976:8 +495:9):10]:100 - 261:9= t) [(25:5+ 10 × 10:10) × 2 + (88:8 +6-33:3) × 2] x (111-101)+1000: u) 665: 7+ [(15 +680 :5+1-918:9) x 10]: 100 = v) [(31 024:4+ 486:9) : 10+1219] x 12 x (5-30:6) = w)5 x (9 x 111 + 74 × 6) - [(500- 112 x 4) x 3 - (100-37):7:3]×2= x) 48 x [790:2 - (956:2-1-237 × 2) × 128 - 1]-4×115= y) 1- [4 x 250 (3+564:3+39-4 x 55) × 99]: 10 = 2) [998 - 455:7 +(99 x 63 - 10 × 2 × 13)]: 10+ 5000 : 1000 = - tiind că a = 20 x 25 + 50 x 4 + 10 × 10, iar b = 10 000:100:10:5, calc h axb a​