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x=8/15
1,5-x=2 1/2
-x=1
x=-1
2^3 +9x=(-1)^3
8+9x=-1
9x=-9
x=-1
3/4 x=2/5 / :3/4
x = 2/5*4/3
x = 8/15
b)
1,5-x=2 1/2
1,5 - 2,5 = x
x = - 1
c)
2 do potęgi 3 +9x=(-1) do potęgi 3
2³ + 9x = ( -1)³
9x = - 1 - 2³
9x = - 1 - 8
9x = - 9 /:9
x = - 1
x=⅖*4:3
x=8:15
x≈0,5
1,5-x=2½
-x=2,5-1,5
-x=1/:/(-1)
x=-1
2³+9x=(-1)³
8+9x=-1
9x=-1-8
9x=-9/:9
x=-1
liczę na naj ;P