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Aurasur
a fost răspuns

2x1+2x3+2x5+2x7+2x9=2x?=

Răspuns :

2•1+2•3+2•5+2•7+2•9=2•?=
2•(1+3+5+7+9)=2•?
2•25=2•25=50
EmaLove
2•1+2•3+2•5+2•7+2•9=2x=?
2+6+10+14+18=50
2x=50
x=50:2
x=25

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