Question

2- Qual o valor de x-y? X+2.(+3/4)+(-2/3) y= (+3/4) -3. (2/3)

Answer 1

x+2(+3/4)+(-2/3)

x+2*3/4-2/3
2*2/3=3/2
x+3/2-2/3
x+3*3/6-2*2/6
x+3*3-2*2/6
x+5/6=0
x = -5/6

y = (+3/4)-3*(2/3)
y = 3/4-3*2/3
3*2/3 = 2
y= 3/4-2
2= 2-1 -----   transformação de 2 em 2/1
y = -2*4/4 + 3/4
y = -2*4+3/4
y = -5/4

Answer 2

Qual o valor de x - y ? 

x - y ==> 10 - ( - 15 ) ==> 10+15 ==> 25
                12       12             12            12
=============================================
X =  +2.(+3)+(-2) ==>   6 - 2  ==> 18 - 8 ==> 10
                4     3            4   3              12          12
========================================================

y= (+3) -3. (2) ==> 3 - 6  ==> 9 - 24 ==> - 15
        4         3         4   3              12            12