а) 2√20-3√45+3√80-√125=2*2√5-3*3√5+3*4√5-5√5=4√5-9√5+12√5-5√5=2√5
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а) 2√20-3√45+3√80-√125=2*2√5-3*3√5+3*4√5-5√5=4√5-9√5+12√5-5√5=2√5