98.6×98.6-98.5×98.7的简便运算五年级上册?
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98.6×98.6一98.5×98.7
=98.5×98.6+0.1×98.6一98.5×98.7
=98.5×(98.6一98.7)+9.86
=98.5×(一0.1)+9.86
=一9.85+9.86
=0.01
=98.5×98.6+0.1×98.6一98.5×98.7
=98.5×(98.6一98.7)+9.86
=98.5×(一0.1)+9.86
=一9.85+9.86
=0.01
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