Question

帮忙解一下数学题

Answer 1

①(100+2)×(100-2)
=100²-2²
=9996

追答

②(50+1)×(50-1)
=50²-1²
=2499

③(90+1/9)×(90-1/9)
=90²-(1/9)²
=8199又1/81

③(90+1/9)×(90-1/9)
=90²-(1/9)²
=8099又1/81

⑤(2010+1)×(2010-1)-2010²
=-1

⑥(100+1)×(100-1)×(10000+1)
=10000²-1
=99999999