27.8*28.7-27.7*28.8简便计算?
3个回答
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27.8*28.7-27.7*28.8
=27.7*28.7-27.7*28.8+0.1*28.7
=27.7*(亏核谨28.7-28.8)销基氏孝+2.87
=2.87-2.77
=0.1
=27.7*28.7-27.7*28.8+0.1*28.7
=27.7*(亏核谨28.7-28.8)销基氏孝+2.87
=2.87-2.77
=0.1
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27.8×28.7-27.7×28.8
=27.8×(27.7+1)让友野坦喊-27.7×(告棚27.8+1)
=27.8×27.7+27.8-27.7×27.8-27.7
=27.8-27.7
=0.1
=27.8×(27.7+1)让友野坦喊-27.7×(告棚27.8+1)
=27.8×27.7+27.8-27.7×27.8-27.7
=27.8-27.7
=0.1
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27.8×28.7-27.7×28.8 =拍配27.8×28.7-27.7×(28.7+0.1)=27.8*28.7-27.7*28.7+27.7*0.1
=(27.8-27.7)野贺薯*28.7+27.7*0.1
=0.1×28.7+27.7×0.1
=0.1×(28.7+27.7)颂者
=0.1×56.4
=5.64
=(27.8-27.7)野贺薯*28.7+27.7*0.1
=0.1×28.7+27.7×0.1
=0.1×(28.7+27.7)颂者
=0.1×56.4
=5.64
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