(imag-part 3.0+0)

Is this code correct? It's part of [complex-representations.md](https://github.com/schemedoc/surveys/blob/master/surveys/complex-representations.md) shouldn't it be:

```scheme
(imag-part 3.0+0i)
```

It looks like `3.0+0` should return a parse error. At least this is what happen in LIPS.