Question

Tìm số nguyên x biết :

7 - x = 8 - ( - 7)

Answer 1

7 - x = 8 - (-7)

7 - x = 8 + 7

7 - x = 15

x = 7 - 15

x = -8

Answer 2

7 - x = 8 - ( -7 )

7 - x = 8 +7

7 - x =15

- x = 15 - 7

- x = 8

=> x = -8

Vậy x = -8

Answer 3

7 - x = 8 - (-7)

7 - x = 15

- x = 7 - 15

- x = -8

x = 8

Answer 4

7 - x = 8 - (-7)

7 - x = 15

x = 7 - 15

x = -8

Answer 5

7 - x = 8 - (-7)

\(7-x=15\)

\(x=7-15\)

\(x=-8\)

Answer 6

7-x = 8-(-7)

7-x = 8+7

7-x = 15

-x = 15-7

-x = 8(-8)

=> x = 8

Answer 7

7 - x = 8 - ( - 7 )

7 - x = 8 + 7

7 - x = 15

x = 15 - 7

Vậy x = 8

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Answer 8

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7 - x = 15

x = 7 - 15

Vậy x = - 8

Answer 9

\(7-x=8-\left(-7\right)\)

\(\Leftrightarrow7-x=8+7\)

\(\Leftrightarrow7-x=15\)

\(\Leftrightarrow x=15-7\)

\(\Leftrightarrow x=8\)

Vậy x=8

Answer 10

7 - x = 8 - (-7)

7 - x = 8+7

7 - x = 15

x = 7 - 15

x = -8

Vậy x = -8

Answer 11

7-x=8-(-7)

7-x=15

x=7-15

x=-8

Vậy x=-8