Tìm x thuộc Z

Question

a) / x - 10 / = 4                                                                    c)/x + 3/ + /-2/ = 4
b) / x + 5 / = 0                                                                     d)/x. (x- 10)/ = 0

Answer 1

a) / x - 10 / = 4                                                                    c)/x + 3/ + /-2/ = 4
b) / x + 5 / = 0                                                                     d)/x. (x- 10)/ = 0

Answer 2

a) / x - 10 / = 4
=> x-10=4                    hoặc                  x-10=-4
     x=4+10                       |                     x=(-4)+10
     x=14                           |                     x=6

b) / x + 5 / = 0
=> x+5=0
     x=0-5
     x=-5

 c)/x + 3/ + /-2/ = 4
    /x + 3/ + 2=4
    /x + 3/=4-2
    /x + 3/=2
=> x+3=2           hoặc          x+3=-2
     x=2-3                            x=-2-3
     x=-1                              x=-5

 d)/x. (x- 10)/ = 0
=> x . (x-10)=0
=> x=0                   hoặc                x-10=0
                                                      x=0+10
                                                      x=10

Answer 3

a) / x - 10 / = 4
=> x - 10 = 4        hoặc   x-10 = -4
     x = 4 +10                 x = (-4) + 10
     x = 14                     x = 6

b) / x + 5 / = 0
=> x + 5= 0
     x = 0 - 5
     x = -5

 c)/x + 3/ + /-2/ = 4
    /x + 3/ + 2 = 4
    /x + 3/ = 4 - 2
    /x + 3/ = 2
=> x+3 = 2          hoặc      x + 3 = -2
     x = 2 - 3                       x = -2 - 3
     x= -1                            x = -5

 d) /x. (x- 10)/ = 0
=> x . (x-10) = 0
=> x = 0              hoặc    x - 10 = 0
                                   x = 0 + 10
                                   x = 10