1,535²*4-465²*4=
=4×(535²-465²)
=4×(535+465)(535-465)
=4×1000×70
=280 000
{ } 2, 2*101²+2*101*98+2*49²
=2×(101²+2×101×49+49²)
=2×(101+49)²
=2×22500
=45000
1,535²*4-465²*4=
=4×(535²-465²)
=4×(535+465)(535-465)
=4×1000×70
=280 000
{ } 2, 2*101²+2*101*98+2*49²
=2×(101²+2×101×49+49²)
=2×(101+49)²
=2×22500
=45000