Основные математические понятия в английском языке. Прокошева И.И. - 8 стр.

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2.1.4. Write these operations
• add 5 times c 2 times d
• multiply the sum of x and y by z
• subtraction 0.5 times d 0.5 times l
• divide v-w by r times s
2.1.5. Read these expressions
•
3603012 =×
•
m
d
md =÷
•
111223 =−
•
()
54/812 =+
•
()( )
[]
4071235 =−∗+
•
()( )
[]
()
[]
4132371235
÷
+>−∗+
2.1.6. Translate into Russian
A can do a piece of work in 8 days. If B can do it in 10 days, in how many days can
both working together do it?
Solution
Let x= the required number of days, then
=
x
1
the part of the work both can do in 1
day;
=
x
1
the part of the work A can do in 1 day; =
x
1
the part of the work B can do in 1
day:
10
1
8
11
+=
x
, or
10
9
Solving,
9
4
4
9
40
==x
, the required number of days.
8
    2.1.4.   Write these operations
       •     add 5 times c 2 times d
       •     multiply the sum of x and y by z
       •     subtraction 0.5 times d 0.5 times l
       •     divide v-w by r times s

    2.1.5. Read these expressions
       • 12 × 30 = 360
                        d
       • d ÷m =
                        m
       •     23 − 12 = 11
       •     (12 + 8) / 4 = 5
       • [(5 + 3) ∗ (12 − 7 )] = 40
       • [(5 + 3) ∗ (12 − 7 )] > [(23 + 13) ÷ 4]

   2.1.6. Translate into Russian
A can do a piece of work in 8 days. If B can do it in 10 days, in how many days can
both working together do it?

Solution
                                                    1
    Let x= the required number of days, then          = the part of the work both can do in 1
                                                    x
    day;
    1                                          1
      = the part of the work A can do in 1 day; = the part of the work B can do in 1
    x                                          x
    day:
                                              1 1 1      9
                                               = + , or
                                              x 8 10    10
                     40    4
    Solving, x =        = 4 , the required number of days.
                     9     9




8

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