$$122 \times 252 - 12234 =$$ ?
122*252-12234
= 122*252-((122*100)+34)
=122*152-34
=122*(122+30)-34
= $$122^{2}$$ +3660-34
= $$(120+2)^{2}$$ +3626
=14400+4+480+3626
=18510
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