September 2018 2 83 Report
Wykonaj działania:
a) 4x-(2x+7)
b) 3a- (3a-2)
c) 2x+2y- (x-y)
d)3b- (- 9-b)
e)(6a+3b)- (12a+5b)
f)x²+y²+z² - (-x²-y²-z²)
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