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2, 6sst-4s(do potęgi 2)+4t+2st=8st-4s(do potęgi2 )+4t
3. a) 5xy-5yx
b) 2+7e(do potęgi2)f(do potęgi 2)
4. 15=5% / :5
3=1% /*100
300=100%
B.
5. 5x(do potęgi 2)-5+2x-2 -5x (do potęgi 2)+20=5x(do potęgi 2)-3x+23
5*3(do 2)-3*3+23=5*9-9+23=59