Частина 2. Номер 216
x : 7 = 4;
x = 4 · 7;
x = 28;
28 : 7 = 4;
4 = 4.
x – 10 = 10;
x = 10 + 10;
x = 20;
20 – 10 = 10;
10 = 10.
x · 10 = 10;
x = 10 : 10;
x = 1;
1 · 10 = 10;
10 = 10.
x : 7 = 4;
x = 4 · 7;
x = 28;
28 : 7 = 4;
4 = 4.
x – 10 = 10;
x = 10 + 10;
x = 20;
20 – 10 = 10;
10 = 10.
x · 10 = 10;
x = 10 : 10;
x = 1;
1 · 10 = 10;
10 = 10.