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2.8 × (-3.9) - 79.15 ÷ 15.23= - 16 4454/38075
1)2.8 × (-3.9) =-10.92
2) 79.15÷15.23 =7915/100 × 100/1523 =
=7915/1523 = 5 300/1523
3) -10.92 - 5 300/1523 = - 10 92/100 - 5 300/1523 =
= -10 140116/152300 - 5 30000/152300=
= -(10+5) - 170116/152300 = - 15 - 42529/38075=
= -15 - 1 4454/38075 = -16 4454/38075
1)2.8 × (-3.9) =-10.92
2) 79.15÷15.23 =7915/100 × 100/1523 =
=7915/1523 = 5 300/1523
3) -10.92 - 5 300/1523 = - 10 92/100 - 5 300/1523 =
= -10 140116/152300 - 5 30000/152300=
= -(10+5) - 170116/152300 = - 15 - 42529/38075=
= -15 - 1 4454/38075 = -16 4454/38075
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