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1. 0, (2) × x-1, (3)=5 supra 2
2. 8 supra 3 x -2,1 (3) =5


Răspuns :

1.
0, (2) × x-1, (3)=5/2                              1,(3)=(13-1)/9=12/9=4/3
2/9
× x-4/3=5/2
2/9 × x=5/2+4/3
2/9 × x=(15+8)/6
2/9 × x=23/6
x=9
×23/2×6
x=69/4
x=17,25

 2.
 8/3 x -2,1 (3) =5                              2,1(3)=(213-21)/90= 192/90=32/15
 8/3 x =5+32/15
 8/3 x =(15×5+32)/15
 8/3 x =107/15
x=107/15:8/3
x=107/15 ×3/8
x=107/40
x=2,675