Склади і розв'яжи задачі за коротким записом Порівняй задачі. Задача 1. На І п. — 12 книг На II п. — ?, на 4 книги більше, ніж на І

Задача 1. На першій полиці стояло 12 книг, а на другій полиці на 4 книги більше, ніж на першій. Скільки книг стояло на двох полицях разом?
Розв'язання.
12 + 4 = 16 (кн.) – книг на другій полиці.
12 + 16 = 28 (кн.) – книг на двох полицях.
Відповідь: 28 книг стояло на двох полицях разом.
Задача 2. На першій полиці стояло 12 книг, на другій  - 16 книг, а на третій – на 8 книг менше, ніж на першій і другій полиці разом. Скільки книг стояло на третій полиці?
Розв'язання.
12 + 16 = 28 (кн.) – книг на І і ІІ полицях разом.
28 – 8 = 20 (кн.) – книг на ІІІ полиці.
Відповідь: 20  книг стояло на третій полиці.

№1

а) (-0,75; 2,75)

б) (0,1875; -5,25)

 

№2

б) n=2/3, m=1/3

в) z=3. y=-0.6

 

6m-9n=-4

2m+5n=4 / * -3

 

6m-9n=-4

-6m-15n=-12

способ сложения

 

-9n-15n=-4-12

-24n=-16

n=2/3

 

2m+5n=4

2m+5*2/3=4

m=1/3

 

 

б) 5y+8z=21  / * -2

      10y-3z=-15

 

    -10y-16z=-42

      10y-3z=-15

      способ сложения

 

      -16z-3z=-42-15

        -19z=-57

          z=3

 

      5y+8z=21

      5y+8*3=21

      5y=21-24

      5y=-3

      y=-0.6

 

 

 

1)  suddenly mr. bunting felt anything take hold of the back of his neck.

did mr. bunting suddenly feel anything take hold of the back of his neck?

did mr. bunting suddenly feel anything take hold of the back of his neck or his arms?

suddenly mr. bunting felt anything take hold of the back of his neck, didn't he?

who felt suddenly   anything take hold of the back of the neck?

what did mr. bunting feel?

 

2)  he was unable to lift his head.

was he unable to lift his head?

was he unable to lift his head or neck?

he was unable to lift his head, wasn't he?

who was unable to lift his head?

what was he unable to lift?

 

3)  mr.bunting looked at cuss, whose face had turned white with fear.

did mr.bunting look at cuss, whose face had turned white with fear?

did mr.bunting or mr.brown look at cuss, whose face had turned white with fear?

mr bunting looked at cuss, whose face had turned white with fear, didn't he?

who looked at cuss?

whom did mr.bunting look at?