a)252² - 251² =63504-63001=503б)252²+2*252*48+48² = 63504+2*252*48+2304=63504+24192+2304=90000
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a)252² - 251² =63504-63001=503
б)252²+2*252*48+48² = 63504+2*252*48+2304=63504+24192+2304=90000