Question

resolva as equações em ir
calcule o valor do x

Answer 1

11) 2 . 7 = 14
12) 8 . 5 = 40
13) 2 . 3 + 1= 7
14) 5 . 2 - 2 = 8
16) 6 . 2 - 3 = 9
17) 5 . 5 - 2= 23
18) 3 . 24 +1= 76
19) 4 . 8 + 1 = 33
20) 7 . 6 - 1= 41 

Answer 2

11)
$2x = 14 \\ < = > x = \frac{14}{2} < = > x = 7$

12)
$8x = 40 \\ < = > x = \frac{40}{8} < = > x = 5$
13)
$2x + 1 = 7 \\ < = > 2x = 7 - 1 \\ < = > 2x = 6 \\ < = > x = \frac{6}{2} < = > x = 3$
14)
$5x - 2 = 8 \\ < = > 5x = 8 + 2 \\ < = > 5x = 10 \\ < = > x = \frac{10}{5} < = > x = 2$
15)
$2x + 1 = 15 \\ < = > 2x = 15 - 1 \\ < = > 2x = 14 \\ < = > x = \frac{14}{2} < = > x = 7$
16)
$6x - 3 = 9 \\ < = > 6x = 9 + 3 \\ < = > 6x = 12 \\ < = > x = \frac{12}{6} < = > x = 2$
17)
$5x - 2 = 23 \\ < = > 5x = 23 + 2 \\ < = > 5x = 25 \\ < = > x = \frac{25}{5} < = > x = 5$
18)
$3x + 1 = 76 \\ < = > 3x = 76 - 1 \\ < = > 3x = 75 \\ < = > x = \frac{75}{3} < = > x = 25$
19)
$4x + 1 = 33 \\ < = > 4x = 33 - 1 \\ < = > 4x = 32 \\ < = > x = \frac{32}{4} < = > x = 8$
20)
$7x - 1 = 41 \\ < = > 7x = 41 + 1 \\ < = > 7x = 42 \\ < = > x = \frac{42}{7} < = > x = 6$