如题所述
=27.6×7.8-2.76×10×6.8
=27.6×7.8-27.6×6.8
=27.6×(7.8-6.8)
=27.6×1
=27.6
=27.6×7.8-27.6×6.8
=27.6×(7.8-6.8)
=27.6×1
=27.6
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第1个回答 2016-10-26
如图
第2个回答 2016-10-26
27.6=10*2.76
27.6×7.8-2.76×68
=2.76*10*7.8-2.76*68
=2.76(10*7.8-68)
=2.76(78-68)
=2.76*10
=27.6
27.6×7.8-2.76×68
=2.76*10*7.8-2.76*68
=2.76(10*7.8-68)
=2.76(78-68)
=2.76*10
=27.6