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(2.39)^2 - (1.61)^2/2.39 - 1.61?

(2.39)^2 - (1.61)^2/2.39 - 1.61?

Explanation

(2.39)^2 - (1.61)^2 = 3.1400

2.39 - 1.61 = 0.78

3.1400 ÷ 0.78 = 4.0256 ≈ 4