Номер 556

Розв’яжіть рівняння:

1) 28 + (45 + x) = 100;
45 + x = 100 – 28;
45 + x = 72;
x = 72 – 45;
x = 27;

2) (y – 25) + 18 = 40;
y – 25 = 40 – 18;
y – 25 = 22;
y = 22 + 25;
y = 47;

3) (70 – x) – 35 = 12;
70 – x = 12 + 35;
70 – x = 47;
x = 70 – 47;
x = 23;

4) 60 – (y + 34) = 5;
y + 34 = 60 – 5;
y + 34 = 55;
y = 55 – 34;
y = 21;

5) 52 – (19 + x) = 17;
19 + x = 52 – 17;
19 + x = 35;
= 35 – 19;
x = 16;

6) 9y – 18 = 72;
9y = 72 + 18;
9y = 90;
y = 90 : 9;
y = 10;

7) 20 + 5x = 100;
5x = 100 – 20;
5x = 80;
x = 80 : 5;
x = 16;

8) 90 – y · 12 = 78;
y · 12 = 90 – 78;
y · 12 = 12;
y = 12 : 12;
y = 1;

9) 10x – 44 = 56;
10x = 56 + 44;
10x = 100;
x = 100 : 10;
x = 10;

10) 84 – 7y = 28;
7y = 84 – 28;
7y = 56;
y = 56 : 7;
y = 8;

11) 121 : (x – 45) = 11;
x – 45 = 121 : 11;
x – 45 = 11;
x = 11 + 45;
x = 56;

12) 77 : (y + 10) = 7;
y + 10 = 77 : 7;
y + 10 = 11;
y = 11 – 10;
y = 1;

13) (x – 12) : 10 = 4;
x – 12 = 4 · 10;
x – 12 = 40;
x = 40 + 12;
x = 52;

14) 55 – y · 10 = 15;
y · 10 = 55 – 15;
y · 10 = 40;
y = 40 : 10;
y = 4;

15) x : 12 + 48 = 91;
x: 12 = 91 – 48;
x : 12 = 43;
x = 43 · 12;
x = 516;

16) 5y + 4y = 99;
9y = 99;
y = 99 : 9;
y = 11;

17) 54x – 27x = 81;
27x = 81;
x = 81 : 27;
x = 3;

18) 36y – 16y + 5y = 0;
25y = 0;
y = 0;

19) 14x + x – 9x + 2 = 56;
6x = 56 – 2;
6x = 54;
x = 54 : 6;
x = 9;

20) 20y – 14y + 7y – 13 = 13;
13y = 13 + 13;
13y = 26:
y = 26 : 13;
y = 2.


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