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(2×3+d)-(7×9+6) =7×7 afla necunoscuta

Răspuns :

(2x3+d)-(7x9+6)=7x7
6+d-69=49
d=49+63
d=112
(2x3+d)-(7x9+6)=7x7 6+d-69=49 d=49+63 d=112