235²-234² = (235-234)(235+234) = 1*469 = 469
19²+2•19•61+61² = (19 + 61 )² = 80² =6400
19²-2•19•9+9² = (19-9)² = 10² = 100
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235²-234² = (235-234)(235+234) = 1*469 = 469
19²+2•19•61+61² = (19 + 61 )² = 80² =6400
19²-2•19•9+9² = (19-9)² = 10² = 100
2)19ˇ2+2.19.61+61ˇ2=(19+61)ˇ2=80ˇ2=6400
3)19ˇ2-2.19.9+9ˇ2=(19-9)ˇ2=10ˇ2=100