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[(13×a+2×7) :4×100-900]:10-9=1​

Răspuns :

[tex][(13 \times a + 2 \times 7) \div 4 \times 100 - 900] \div 10 - 9 = 1[/tex]

[tex][(13 \times a + 2 \times 7) \div 4 \times 100 - 900] \div 10 = 10[/tex]

[tex](13 \times a + 2 \times 7) \div 4 \times 100 - 900 = 100[/tex]

[tex](13 \times a + 2 \times 7) \div 4 \times 100 = 1000[/tex]

[tex](13 \times a + 2 \times 7) \div 4 = 10[/tex]

[tex]13 \times a + 14 = 40[/tex]

[tex]13 \times a = 26[/tex]

[tex]a = 2[/tex]