92-(31+19)+58=100
73+(61-45)-26=63
(63+17)-(100-24)=4
(81-35)+(48-19)=75
92 - (31 + 19) + 58 = 100
1) 31 + 19 = 50
2) 92 - 50 = 42
3) 42 + 58 = 100
73 + (61 - 45) - 26 = 63
1) 61 - 45 = 16
2) 73 + 16 = 89
3) 89 - 26 = 63
(63 + 17) - (100 - 24) = 4
1) 63 + 17 = 80
2) 100 - 24 = 76
3) 80 - 76 = 4
(81 - 35) + (48 - 19) = 75
1) 81 - 35 = 46
2) 48 - 19 = 29
3) 46 + 29 = 75
