3.17+7.48-2.78+0.53-3.48-1.02+5.3
=(3.17+0.53)+(7.48-3.48)-(2.78+1.02)+5.3
=3.7+4-3.8+5.3
=(3.7+5.3)+(4-3.8)
=9+0.2
=9.2
3.17+7.48-2.78+0.53-3.48-1.02+5.3
2个回答
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