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a fost răspuns

rezolvati;
a). 2·(x+3,9)+1,2+20
c). 2·(x+1)=3,4+5,98
e). 18 +2·(2x+0,6)-14,5=21
g). 5·(3,14+x)-11=8,71
i).2·(4+3x)-1,4+18,9

Răspuns :

Nalaby
a). 2·(x+3,9)=1,2+20
2x+7,8=21,2
2x=13,4
x=6.7
c). 2·(x+1)=3,4+5,98
2x+2=9.38
2x=7,38
x=3,69
e). 18 +2·(2x+0,6)-14,5=21
18+4x+1,2-14,5=21
4x=16,3
x=4,075
g). 5·(3,14+x)-11=8,71
15,7+5x-11=8.71
5x =8.71-15.7+11
5x=4.01
x=0.802
i).2·(4+3x)=1,4+18,9 daca e asa atunci 
8+6x=1.4+18.9
6x=1.4+18.9-8
x=12.3:6
x=2.05
iar daca nu atunci
.2·(4+3x)-1,4=18,9 
8+6x-1.4=18.9
6x=18.9-8+1.4
6x =12.3 
x=2.05
rsp e acelasi , rezolvarea putin diferita 

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