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19×25+2×[9×5+2×(y-149×2)]=973​

Răspuns :

Răspuns: y=400

Explicație pas cu pas:

19×25+2×[9×5+2×(y-149×2)]=973

475+2×[45+2×(y-298)]=973

2×[45+2×(y-298)]=973-475

2×[45+2×(y-298)]=498

45+2×(y-298)=498÷2

45+2×(y-298)=249

2×(y-298)=249-45

2×(y-298)=204

y-298=204÷2

y-298=102

y=102+298

y=400

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Verificare:

19×25+2×[9×5+2×(400-149×2)]=973

475+2×[45+2×(400-298)]=973

475+2×(45+2×102)=973

475+2×(45+204)=973

475+2×249=973

475+498=973