怎样简便怎样算.三克油.8.8-7.72+10.2-2.28 0.25×39+0.25

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怎样简便怎样算.三克油.8.8-7.72+10.2-2.28 0.25×39+0.25

怎样简便怎样算.三克油.8.8-7.72+10.2-2.28 0.25×39+0.25
怎样简便怎样算.三克油.
8.8-7.72+10.2-2.28 0.25×39+0.25

怎样简便怎样算.三克油.8.8-7.72+10.2-2.28 0.25×39+0.25
8.8-7.72+10.2-2.28
=(8.8+10.2)-(7.72+2.28)
=19-10
=9
0.25×39+0.25
=0.25×(39+1)
=0.25×40
=10