September 2018 1 13 Report

1.Rozwiąż:
a) 9(x-7y)-(5y-2x)+20y
dla: x= 0,5; y= 0,3
b) (5x+7y)-8(y+1)+3(x-y)
dla: x= \frac{1}{2} y= \frac{1}{4}


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