21,3²-21,2²=(21,3-21,2)(21,3+21,2)=0,1*42,5=4,25
(0,25a²-0,16b²)100ab=25a³b-16ab³
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21,3²-21,2²=(21,3-21,2)(21,3+21,2)=0,1*42,5=4,25
(0,25a²-0,16b²)100ab=25a³b-16ab³