a |x+3|-3x=15 với x bé hơn hoặc bằng -3 b |x-1|+2x=10 c |2x-3|=|5x+1| d |12x-4|+|3x+12|=6 15/07/2021 Bởi Reese a |x+3|-3x=15 với x bé hơn hoặc bằng -3 b |x-1|+2x=10 c |2x-3|=|5x+1| d |12x-4|+|3x+12|=6
b, (x+1)^3 -(x-1)^3-6(x-1)^2=-10 x3 + 3x2 + 3x + 1 – x3 + 3x2 – 3x + 1 – 6(x2 – 2x + 1) = – 10 6x2 – 6x2 + 12x = -10 – 1 – 1 + 6 12x = – 6 x=-0,5 c, 3=3x−1 3+1=3x 4=3x `4/3=x` `x=4/3` Bình luận
b,
(x+1)^3 -(x-1)^3-6(x-1)^2=-10
x3 + 3x2 + 3x + 1 – x3 + 3x2 – 3x + 1 – 6(x2 – 2x + 1) = – 10
6x2 – 6x2 + 12x = -10 – 1 – 1 + 6
12x = – 6
x=-0,5
c,
3=3x−1
3+1=3x
4=3x
`4/3=x`
`x=4/3`