If the probability that student A will fail a certain statistics examination is 0.5, the probability that student B will fail the examination is 0.2, and the probability that both student A and student B will fail the examination is 0.1. (1)What is the probability that at least one of these two students will fail the examination? (2)What is the probability that neither student A nor student B will fail the examination? (3)what is the probability that exactly one of the two students will fail the examination? (Write your answer with 1 decimal place)