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nie dzielimy przez zero:
x + 2 ≠
x ≠ -2
D= R \ {-2}
b)
3x - 1 ≠ 0
3x ≠ 1 /:3
x ≠ 1/3
D = R \ {1/3}
c)
2x + 5 ≠ 0
2x ≠ - 5 /:2
x ≠ -2,5
D = R \ {-2,5}
x-2 D=R/{-2}
2.
3x-10
3x1/:3
x1/3 D=R/{1/3}
3.
2x+50
2x-5/:2
x-2,5 D=R/{-2,5}