1) 12/7 = 4/21х;
4/21x = 12/7;
x = 12/7 ÷ 4/21;
x = 12/7 × 21/4;
x = 12 × 21/7 × 4;
x = 3 × 3/1 × 1;
x = 9/1;
x = 9.
ответ: 9.
2) 12/7 = 4/21х;
12 × 21x = 7 × 4;
12 × 21x = 28;
21x = 28 ÷ 12;
21x = 28/12;
x = 28/12 ÷ 21;
x = 28/12 × 1/21;
x = 28 × 1/12 × 21;
x = 1 × 1/ 3 × 3;
x = 1/9.
ответ: 1/9.
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ответ:1/9
Пошаговое объяснение:
1) 12/7 = 4/21х;
4/21x = 12/7;
x = 12/7 ÷ 4/21;
x = 12/7 × 21/4;
x = 12 × 21/7 × 4;
x = 3 × 3/1 × 1;
x = 9/1;
x = 9.
ответ: 9.
2) 12/7 = 4/21х;
12 × 21x = 7 × 4;
12 × 21x = 28;
21x = 28 ÷ 12;
21x = 28/12;
x = 28/12 ÷ 21;
x = 28/12 × 1/21;
x = 28 × 1/12 × 21;
x = 1 × 1/ 3 × 3;
x = 1/9.
ответ: 1/9.
___________
Удачи Вам! :)
ответ:1/9
Пошаговое объяснение: