Question

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Calculează: a) 1/2+1/3 b) 2/3+3/4 c) 1/4+5/6 d) 5/6+7/9 e) 1/18+1/12 f) 1/3x7(la puterea 2)+1/7x3(la puterea 2)+1/3(la puterea 2)x7(la puterea 2) g) 1/5+1/5(la puterea 2)+1/5(la puterea 3)​

Answer 1

Răspuns:

a. ³⁾1/2+²⁾1/3=3/6+2/6=5/6

b. ⁴⁾2/3+³⁾3/4=8/12+9/12=17/12

c. ³⁾1/4+²⁾5/6=3/12+10/12=13/12

d. ³⁾5/6+²⁾7/9=15/18+14/18=29/18

e. ²⁾1/18+³⁾1/12=2/36+3/36=5/36

f. 1/3·7²+1/3·3²+1/3·7²=1/3(7²+3²+7²)=1/3·107=107/3

g. 1/5+(1/5)²+(1/5)³=

1/5[²⁵⁾1+⁵1/5+1/25]=1/5·(25/25+5/25+1/25)=1/5·31/25=31/125