Вычислите
1) 84,5^2-59,5^2/61^2-11^2
2) 124^2-144/239^2-1089
3) 106^2-121/122^2-64
4) 13,5^2-72,25/73,5^2-68,5^2
пожалуйста помогите решить плиизз
^2-в квадрате
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