Вычислите:
а)53*121 -53*221 =

б)39*528-728*39 =

в)-76*75-76*125=

г)37*85-85*47 =

е)81*176-81*276 =

ж)-35*74-35*126 =

з)128*375+625*128 =

и)729*241-929*241 =

к)-54*13-46*13 =
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