Question

[(1 + 2 x 3): a + 5]:6=9:9 ​

Answer 1

Explicație pas cu pas:

[(1+2×3):a+5]:6=9:9

[(1+6):a+5]=1

[7:a+5]=1×6

[7:a+5]=6

7:a=6-5

7:a=1

a=7×1

a=7

!

Answer 2

Răspuns:

$((1 + 2 \times 3) \div a + 5) \div 6 = 9 \div 9$

$\frac{(1 + 2 \times 3) \div a + 5}{6} = 9 \div 9$

$\frac{(1 + 6) \div a + 5}{6} = 1$

$\frac{7 \div a + 5}{6} = 1$

$\frac{ \frac{7}{a} + 5 }{6} = 1$

$\frac{ \frac{7 + 5a}{a} }{6} = 1$

$\frac{7 + 5a}{6a} = 1$

$7 + 5a = 6a$

$5a - 6a = - 7$

$- a = - 7$

$a = 7$