Răspuns :
(13×x-416:4):7=13
13x-416:4=13 ×7
13x-416:4=91
13x-104=91
13x=91+104
13x=195
x=195:13
x=15
V=r+3
v+r=15
r+3+r=15
2r+3=15
2r=15-3
2r=12
r=12:2
r=6
v=r+3=6+3=9
Radu are 6 ani
Vlad are 9 ani
13x-416:4=13 ×7
13x-416:4=91
13x-104=91
13x=91+104
13x=195
x=195:13
x=15
V=r+3
v+r=15
r+3+r=15
2r+3=15
2r=15-3
2r=12
r=12:2
r=6
v=r+3=6+3=9
Radu are 6 ani
Vlad are 9 ani
[tex](13 \times x - 416 \div 4) \div 7 = 13[/tex]
[tex](13x - 104) \div 7 = 13[/tex]
[tex]13x - 104 = 13 \times 7[/tex]
[tex]13x - 104 =91[/tex]
[tex]13x = 91 + 104[/tex]
[tex]13x = 195[/tex]
[tex]x = 195 \div 13[/tex]
[tex]x = 15[/tex]
[tex]v + r = x[/tex]
[tex]v = r + 3[/tex]
[tex]r + 3 + r = x[/tex]
[tex]r + 3 + r = 15[/tex]
[tex]r + r = 15 - 3[/tex]
[tex]2r = 12 [/tex]
[tex]r = 12 \div 2[/tex]
[tex]r = 6[/tex]
[tex]v = r + 3[/tex]
[tex]v = 6 + 3[/tex]
[tex]v = 9[/tex]
[tex](13x - 104) \div 7 = 13[/tex]
[tex]13x - 104 = 13 \times 7[/tex]
[tex]13x - 104 =91[/tex]
[tex]13x = 91 + 104[/tex]
[tex]13x = 195[/tex]
[tex]x = 195 \div 13[/tex]
[tex]x = 15[/tex]
[tex]v + r = x[/tex]
[tex]v = r + 3[/tex]
[tex]r + 3 + r = x[/tex]
[tex]r + 3 + r = 15[/tex]
[tex]r + r = 15 - 3[/tex]
[tex]2r = 12 [/tex]
[tex]r = 12 \div 2[/tex]
[tex]r = 6[/tex]
[tex]v = r + 3[/tex]
[tex]v = 6 + 3[/tex]
[tex]v = 9[/tex]