Question

(2k-c)(2k+c)+(c-0.5k)(c+0,5k)
при k=0.4, c=1.7
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Answer 1

(2k)^2-c^2+c^2-(0.5k)^2=4k^2-c^2+c^2-0.25k^2=4.25k^2+2c^2