Question

用便方法计算这道数学题98.6×98.6-98.5×98.7

用便方法计算这道数学题98.6×98.6-98.5×98.7

Answer 1

图掘咐枯判洞简岩

Answer 2

解：98.6×98.6-98.5×98.7=98.6²敏搜-（98.6-0.1）（98.6+0.1）瞎燃=98.6²-98.6²磨拿虚+0.01=0.01

Answer 3

98.6×98.6-98.5×98.7
=98.6×98.6-（仔答祥98.6-0.1）举稿×（98.6+0.1）念搏
=98.6×98.6-98.6×98.6+0.1×0.1
=0.01

Answer 4

98.6×98.6-98.5×98.7
=98.6×98.7-98.6×0.1-98.5×98.7
=98.5×98.7+0.1×98.7-98.5×98.7-98.6×0.1
= 0.1×98.7-98.6×0.1
=9.87-9.86
=0.01
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Answer 5

98.6×98.6-98.5×98.7
=98.6×98.6-(98.6-0.1)×(98.6+0.1)
=98.6×98.6-(98.6×98.6-(0.1)^2)
=(0.1)^2
=0.01