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★ (421+322)+ X=876
★ X+(536-321)=645
★ X-(418-308)=539
★ (644+133)-X=424
★ 1×2×3×4×5×6×7×a=0
★ 2×9×3×7×a×5×10=18×50×7×12×3
Ajutatima va rog dau 100 puncte si o coroniță


Răspuns :

1. 743+x=876
x=876-743
x=133

2.x+215=645
x=645-215
x=430

3.x-110=539
x=539+110
x=649

4.777-x=424
x=777-424
x=353

5. a= 0(orice nr. inmultit cu 0 da zero)

6. a=12 (2•9=18; 5•10=50 si au ramas la ambele parti 7•3•12)
Sper ca te-am ajutat