Bài 1 : tìm x thuộc z
a. 15 – x = 7 – ( -2 )
b. x – 35 = ( -12 ) – 3
c. | x + 2 |= 0
d. |x – 5 | = 7
e. 25 – ( 30 + x ) = 15 – ( -11 )
f. ( x – 12 ) – 15 = 20 – 7 – ( – | -12 | )
Bài 1 : tìm x thuộc z
a. 15 – x = 7 – ( -2 )
b. x – 35 = ( -12 ) – 3
c. | x + 2 |= 0
d. |x – 5 | = 7
e. 25 – ( 30 + x ) = 15 – ( -11 )
f. ( x – 12 ) – 15 = 20 – 7 – ( – | -12 | )
a. 15 – x = 7-(-2)
15 – x = 9
x = 15-9
x = 6
b. x – 35 = (-12) – 3
x – 35 = -15
x = -15 + 35
x = 20
c. | x+2 | = 0
x+2 = 0
⇒ x=-2
d. | x-5 | = 7
x-5 = 7 hoặc x-5 = -7
x = 7+5 hoặc x = -7+5
x = 12 hoặc x = -2
e. 25 – (30+x) = 15 – (-11)
25 – (30+x) = 26
30+x = 25-26
30+x = -1
x = -1 – 30
x = -31
f. (x-12) – 15 = 20 – 7 – (-|-12|)
(x-12) – 15 = 13 – (-12)
(x-12) – 15 = 15
(x-12) = 15+15
x-12 = 30
x = 30 + 12
x = 42
Xin hay nhất nha
a. 15 – x = 7 – (-2),,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ;15 – x = 9,,,,,,,,,,,,,,,,,,,,,, ; x=15-9,,,,,,,,,,,,,,,,,; x=6,,,,,,,,,,,,,,,,,,,,,, b. x – 35 = ( -12 ) – 3,,,,,,,,,,,,, ; x – 35 = -15,,,,,,,,,,,,,,; x = -15 + -35,,,,,,,,,,; x = -50,,,,,,,,,,,; c. | x + 2| = 0 => x = -2,,,,,,,,,,,,,,; d. | x – 5 |= 7 => x = 7 + 5 hoặc x = -7 + 5,,,,,,,,,,,,,,; x = 12 hoặc x = -2,,,,,,,,,,,,,,,,,,; e. 25 – ( 30 + x ) = 15 – ( -11 ),,,,,,,,,,,,,,; 30 + x = 25 – 26 =-1,,,,,; x = -1 – 30 = -31,,,,,,,,,,,,; f. ( x – 12 ) – 15 = 20 – 7 – ( – | -12 | ),,,,; x – 12 = 40,,,,,,; x = 52……………( Bạn hãy nhìn theo chiều ngang vì máy của mình không viết xuống dòng được ),,,,,,,,,,,, nếu có chỗ nào thắc mắc cứ hỏi mình.