535的平方x4-465的平方x4
问题描述：
535的平方x4-465的平方x4
535^2x4-465^2x4 102^2+102x196+98^2
答
①535^2x4-465^2x4
=4×(535²－465²)
=4×(535+465)(535-465)
=4×1000×70
=280000
②102^2+102x196+98^2
=102²+2×102×98+98²
=(102+98)²
=200²
=40000