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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`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`