Mnożenie jednomianów przez sumy.
-2√2 (a+√2b) - 4(a√2-2b)=
= -2a√2 -4b -4a√2 +8b = -6a√2 +4b
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-2√2 (a+√2b) - 4(a√2-2b)=
= -2a√2 -4b -4a√2 +8b = -6a√2 +4b