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Răspuns :

la punctul b) 5.13+0.25+1.7=7.08
x=8.48-7.08=> x=1.4
Vezi imaginea MARIAELENA5
a)Ma=(1,02+x+5,4):3=3,24
(1,02+x+5,4):3=3,24
(6,42+x):3=3,24
6,42+x=3,24·3
6,42+x=9,72
x=9,72-6,42=3,3
b) Ma=(5,13+0,25+1,7+x)/4=2,12
(5,13+0,25+1,7+x)/4=2,12
(7,08+x)/4=2,12
7,08+x=2,12×4
7,08+x=8,48
x=8,48-7,08=1,4