1. What were positive integers used for? 2. When was the number system completed? 3. Are the first numbers which we use the positive integers or the negative ones? 4. Is unity a first or a last integer? 5. By what is the division point between positive and negative numbers occupied? 6. What are rational numbers? 7. Can irrational numbers be expressed as quotients of two or three integers? 8. What numbers are called imaginaries? 9. What do we assign to each point on the line? 10. What do we use to denote the real part of a complex number?
Ex. 9. Find the Russian equivalents for the following English word combinations.
1. in either direction; 2. imaginaries; 3. is composed of; 4. real and imaginary parts; 5. a quotient of two integers; 6. the number system; 7. to denote the real part; 8. is replaced by; 9. the basic system; 10. in terms of; 11. to correspond to a subset.
a. основная система; b. система чисел; c. действительные и мнимые части; d. в любом направлении; e. заменяется; f. обозначать действительную часть; g. состоит из; h. мнимые числа; i. частное двух чисел; j. через, посредством; k. соответствовать подмножеству