Răspuns :
[(5+3)×7+(4+3+27)]×7=630
(8×7+34)×7=630
(56+34)×7=630
90×7=630
630=630 deci da
Adevărat:
[tex]\left[\left(35\div \:7+21\div \:7\right)\times \:7+\left(4+9\div \:3+27\right)\right]\times \:7[/tex]
[tex]=8\times \:7+\left(4+9\div \:3+27\right) =8\times \:7+34=56+34 =90[/tex]
[tex]=90\times \:7 =630[/tex]