3×19²+6×1+19×21+3×21²
来源：学生学帮网 编辑：学帮网 时间：2024/06/25 05:17:07
3×19²+6×1+19×21+3×21²
3×19²+6×1+19×21+3×21²
=3(19²+21²+2*19*21)-5*19*21+6
=3*(19+21)^2-5*19*21+6
=4800-5(20-1)*(20+1)+6
=4800-5(20^2-1)+6
=4800-2000+11
=2811
3×19²+6×1+19×21+3×21²
3×19²+6×1+19×21+3×21²
=3(19²+21²+2*19*21)-5*19*21+6
=3*(19+21)^2-5*19*21+6
=4800-5(20-1)*(20+1)+6
=4800-5(20^2-1)+6
=4800-2000+11
=2811