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50625 - 625 = 50000
(70+2)^2= 4900+280+4=5184
62 do kwadratu
(60+2)^2=3600+240+4=3844
225 do kwadratu
(200+25)^2= 40000+10000+625=50625
25 do kwadratu
(20+5)^2=400+200+25=625
a) 5184-3844=1340
b) 50625-625=50000