98.6×98.6-98.5×98.7=?要简便计算
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98.6x98.6-98.5x98.7
=98.6x98.6-98.5x(98.6+0.1)
=98.6x98.6-98.5x98.6-9.85
=98.6x(98.6-98.5)-9.85
=9.86-9.85
=0.01
=98.6x98.6-98.5x(98.6+0.1)
=98.6x98.6-98.5x98.6-9.85
=98.6x(98.6-98.5)-9.85
=9.86-9.85
=0.01
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