0.28×9+0.28 6.6-0.78+2.4-3.22

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0.28×9+0.286.6-0.78+2.4-3.220.28×9+0.286.6-0.78+2.4-3.220.28×9+0.286.6-0.78+2.4-3.220.28×9+0.28=0.28

0.28×9+0.28 6.6-0.78+2.4-3.22
0.28×9+0.28 6.6-0.78+2.4-3.22

0.28×9+0.28 6.6-0.78+2.4-3.22
0.28×9+0.28
=0.28×(9+1)
=0.28×10
=2.8
6.6-0.78+2.4-3.22
=(6.6+2.4)-(0.78+3.22)
=9-4
=5

0.28*(9+1)=2.8
(6.6+2.4)-(0.78+3.22)=9-4=5
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0.28×9+0.28
=0.28×(9+1)
=0.28×10
=2.8
6.6-0.78+2.4-3.22
=(6.6+2.4)-(0.78+3.22)
=9-4
=5

0.28×9+0.28
=0.28×(9+1)
=0.28×10
=2.8
6.6-0.78+2.4-3.22
=(6.6+2.4)-(0.78+3.22)
=9-4
=5

第一个答案0.28*(9+1)=0.28*10=2.8。第二个答案6.6+2.4-(0.78+3.22)=5.望楼主采纳。。。