Do the Exercises
1. m + n 4. Add 2 times c to 5 times d.
2. x-y 5. Subtract 2 times 4 from m times n.
3. a (4-6) 6. Divide v - w by r times s.
EXERCISES:
1. Read the following words paying attention to the pronunciation:
algebra, also, double, triangle, quotient, quantity, sign, frequently, twice, meaning, complete, parenthesis, arithmetic, fraction, subtraction, minus.
2. Form nouns of the following words:
to indicate, to add, to operate, to subtract, to mean, to express, to divide, to place, to differ.
3. Make up sentences of your own using the words and expressions given below:
serve to distinguish, to give a zero result, combine with, both plus and minus, either plus or minus.
4. Answer the following questions:
1. What signs are used in algebra?
2. What do signs (+) and (-) indicate?
3. How is the sign (=) read?
4. What is the equality sign?
5. What is the meaning of the multiplication sign?
6. What does the expression (a-b) mean?
5. Translate into Russian:
ab means the same as a x b and 2 x с means the same as 2c, twice c. We cannot write 23, however, for 2 x 3 as 23 has another meaning, namely, the number 23. Therefore, in general, the multiplication sign (x) lay be omitted between algebraic symbols and an ordinary arithmetical umber, but not between two arithmetical numbers.
Another sign which is sometimes used is the inclined fraction line (/); thus 6/3 means the same as 6:3. This form has the advantage of being compact and also allowing both dividend and divisor (or numerator and denominator) to be written n the same line.
6. Translate into English:
В алгебре мы применяем следующие знаки: плюс, минус, знак равенства, знак деления, скобки круглые, квадратные и фигурные, знак "больше, чем", "меньше, чем" и другие. Знак три точки по углам треугольника означает "следовательно" или "поэтому".
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