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4.10. Dokończ zdanie tak, aby otrzymać zdanie prawdziwe
Opuszczając nawiasy w wyrażeniu (-0,5a+3ab-b+1) + (1,5a-2ab+2b-2), otrzymamy

A. 2a+5ab-3b+3.

B. -a+1,5ab+b-1.

C. -2a+ab-b+2.

D. a+ab+b-1.
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