a) -8+ x= (-3) -8 b) x -8+ (-16) = -10 c) -19-2x = 18 -21 d) -5< -x -1< 4và x ε N e) -50: x2+ (-10)= -12 tim x

2 câu trả lời

`a, -8 + x = (-3) - 8`

`=> -8 + x = -11`

`=> x = -11 + 8`

`=> x = -3`

Vậy `x = -3`

`b, x - 8 + (-16) = -10`

`=> x - 8 = -10 + 16`

`=> x - 8 = 6`

`=> x = 6+8`

`=> x = 14`

Vậy `x = 14`

`c, -19 - 2x = 18 - 21`

`=> -19 - 2x = -3`

`=> 2x = -19 - (-3)`

`=> 2x = -16`

`=> x = -16 : 2 = -8`

Vậy `x = -8`

`d, -5 < -x -1 < 4`

`=> -x - 1 in {-4;-3;-2;-1;0;1;2;3}`

`=> -x in {-3;-2;-1;0;1;2;3;4}`

`=> x in {3; 2; 1; 0; -1; -2; -3; -4}`

`e, -50 : x^2 + (-10) = -12`

`=> -50 : x^2 = -12 + 10`

`=> -50 : x^2 = -2`

`=> x^2 = -50 : (-2)`

`=> x^2 = 25`

`=> x^2 = (±5)^2`

`=> x = ±5`

Vậy `x = ±5`

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`\text{Giải thích các bước giải:}`

`a)-8+x=(-3)-8`

`x=-3-8+8`

`x=-3`

`b)x -8+(-16) = -10``x=-10+8+16`

`x=14`

`c)19-2x = 18 -21`

`2x=18-21-19`

`2x=-25`

`x=-25/2`

`d)-5<-x-1<4`

`=>x-1\in{-4;-3;-2;-1;0;1;2;3}`

`=>x\in{-3;-2;-1;0;1;2;3;4}`

`e)-50: x2+ (-10)= -12`

`-50:x^2=-12+10`

`-50:x^2=-2`

`x^2=-50:-2`

`x^2=25`

`x^2=5^2`

`x=+-5`

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