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12/1236 = 1/103
2)
15/8 - 2/36
= 135/72 - 4/72
= 131/72
3)
0,7+1,2:(0,06 x 0,4)
= 0,7 + 1,2 : (0,024)
= 0,7 + 50
= 50,7
4)
5/15+19/2 x 8,3 - 3
=1/3 + 19/2 x 83/10 - 3
=1/3 + 1577/20 - 3
=20/60 + 31540/60 - 180/60
=31700/60
=3170/6
=1585/3
Semoga membantu^^