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2016-10-07
展开全部
5.8*7.9+2.1*4.2
=5.8*(10-2.1)+2.1*4.2
=58-2.1*5.8+2.1*4.2
=58-2.1*(5.8-4.2)
=58-2.1*1.6
=58-(2+0.1)*1.6
=58-3.2-0.16
=54.64
=5.8*(10-2.1)+2.1*4.2
=58-2.1*5.8+2.1*4.2
=58-2.1*(5.8-4.2)
=58-2.1*1.6
=58-(2+0.1)*1.6
=58-3.2-0.16
=54.64
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