am nevoie urgent
va rogggg

Răspuns:
9.P=8√6
l=8√6/4=2√6cm
A=l²=(2√6)²=4*6=24cm²
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b)√2+√8+√18+√32+....+√800=
√2(1+√4+√9+,,,+√400)=
√2(1+2+3+...+20)=suma gauss=√2*20*21/2=10*21√2=210√2
Explicație pas cu pas: