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3*3=9
9- 5:5= 8
b)
2 * 73* 0,42=60,48
2-73-0,42= -71.42
60,48+(-71,42)=-10,94
2,73 - 0,42 = 2,31
6,5 + 2,31 = 7,81
a) 3,3 × 5,5 = 18,15
3,3 ÷ 5,5 = 0,6
18,15 - 0,6 = 17,55