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a ÷ 100 ÷ 10 x 3 + 390 = 510

Răspuns :

[tex]a \div 100 \div 10 \times 3 + 390 = 510[/tex]

[tex] \frac{1}{100}a \times \frac{1}{10} \times 3 + 390 = 510 [/tex]

[tex] \frac{3}{1000}a + 390 = 510 [/tex]

[tex]3a + 390000 = 510000[/tex]

[tex]3a = 510000 - 390000[/tex]

[tex]3a = 120000[/tex]

[tex]a = 40000[/tex]