Проверить верно ли равенство (A+B)2=A2+2AB+B2

A+B=1543-1321-4-5+101-213469=1644-345524
(A+B)2=1644-345524∙1644-345524=
=16∙16+4∙-3+4∙516∙4+4∙4+4∙216∙4+4∙5+4∙4-3∙16+4∙-3+5∙5-3∙4+4∙4+5∙2-3∙4+4∙5+5∙45∙16+2∙-3+4∙55∙4+2∙4+4∙25∙4+2∙5+4∙4=
=26488100-351428943646
A2=1543-1321-4-5∙1543-1321-4-5=
=15∙15+4∙-1+3∙115∙4+4∙3+3∙-415∙3+4∙2+3∙-5-1∙15+3∙-1+2∙1-1∙4+3∙3+2∙-4-1∙3+3∙2+2∙-51∙15+-4∙-1+-5∙11∙4+-4∙3+-5∙-41∙3+-4∙2+-5∙-5
=2246038-16-3-7141220
2AB=2∙1543-1321-4-5∙101-213469=
=2∙15∙1+4∙-2+3∙415∙0+4∙1+3∙615∙1+4∙3+3∙9-1∙1+3∙-2+2∙4-1∙0+3∙1+2∙6-1∙1+3∙3+2∙91∙1+-4∙-2+(-5)∙41∙0+-4∙1+(-5)∙61∙1+-4∙3+(-5)∙9=
=2∙19225411526-11-34-56=384410823052-22-68-112
B2=101-213469∙101-213469=
=1∙1+0∙-2+1∙41∙0+0∙1+1∙61∙1+0∙3+1∙9-2∙1+1∙-2+3∙4-2∙0+1∙1+3∙6-2∙1+1∙3+3∙94∙1+6∙-2+9∙44∙0+6∙1+9∙64∙1+6∙3+9∙9=
=5610819282860103
A2+2AB+B2=2246038-16-3-7141220+384410823052-22-68-112+5610819282860103=
=267110156-6467320411
(A+B)2≠A2+2AB+B2