Question

Calcule mentalmente o valor de X.

x+12=10
___________

9x=27
____________

16x=-32
____________

0,7x=1,4
____________

-5x=30
____________

X
_ = 5
-2
____________

X
_ = -6
-4

Answer 1

i) x = 10 -12

x = -2

ii) x = 27/9

x = 3

iii) x = -32/16

x = -2

iv) x = 1,4/0,7

x = 14/10/7/10

x = 14/10 * 10/7

x = 140/70

x = 2

v) x = -30/5

x = -6

vi) x = - 10

vii) x = (-6) x (-4)

x = 24