Question

Tìm​ x thuộc Z biết

​a,(x-2):(-5)=-7

b,(x-1)^2=|-25|

Answer 1

a) (x - 2) : (-5) = -7

x - 2 = (-7) . (-5)

x - 2 = 35

x = 35 + 2 = 37

b) (x - 1)² = |-25|

(x - 1)² = 25

(x - 1)² = 5²

=> x - 1 = 5 => x = 5 - 1 = 4.

Answer 2

a/

\(\left(x-2\right):\left(-5\right)=-7\)

\(\Rightarrow x-2=\left(-7\right).\left(-5\right)\)

\(\Rightarrow x-2=35\)

\(\Rightarrow x=37\)

Vậy \(x=37\)

b/

\(\left(x-1\right)^2=\left|-25\right|\)

\(\Rightarrow\left(x-1\right)^2=5^2\)

\(\Rightarrow x-1=5\)

\(\Rightarrow x=6\)

Vậy \(x=6\)

Answer 3

a,(x-2):(-5)=-7

x-2=-7*-5

x-2=35

x=35+2=37