[tex]750 | 2*5\\\\\\\\75 | 5\\\\\\\\15 | 5\\\\\\\\3 | 3\\\\\\\\1\\\\\\\\750 = 2 * 5^{2} * 3\\\\\\\\\\\\1000 | 2*5\\\\\\\\100 | 2*5\\\\\\\\10 | 2*5\\\\\\\\1\\\\100 = 2^{3} * 5^{3}\\\\\\\\[/tex]
750 = 250·3 = 25 x 10 x 3 = 5²·2·5·3 = 2·3·5³
1000 = 100·10 = 25·4·2·5 = 5²·2²·2·5 = 2³·5³