简便计算98的平方-101*99
98²-101×99
=98²-(100²-1)
=98²-100²+1
=(98+100)×(98-100)+1
=198×(-2)+1
=-396+1
=-395
98^2-101*99
=98(99-1)-101*99
=98*99-98-101*99
=98*99-101*99-98
=99(98-101)-98
=99*(-3)-98
=-297-98
=-395
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98²-101×99
=98²-(100²-1)
=98²-100²+1
=(98+100)×(98-100)+1
=198×(-2)+1
=-396+1
=-395
98^2-101*99
=98(99-1)-101*99
=98*99-98-101*99
=98*99-101*99-98
=99(98-101)-98
=99*(-3)-98
=-297-98
=-395