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neriman04
neriman04
05.11.2022 17:29 •  Математика

Цифра десятков двузначного числа меньше цифры единиц на 2 а сумма квадратов цифр этого числа рвана 34,найдите это число

👇
Ответ:
ukimui123
ukimui123
05.11.2022
Пусть А - цифра десятков двузначного числа,
В - цифра единиц
Само число равно 10•А + В
Получается система уравнений:
А+2=В
А^2 + В^2=34
Подставляем во второе уравнение В
А^2 + (А+2)^2 =34
А^2 + А^2 + 4А + 4 -34=0
2А^ + 4А - 30 =0
А^2 + 2А - 15 =0
А1=3
А2=-5 не подходит
В=2+А=2+3=5
Это число 53
4,8(94 оценок)
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Ответ:
tseng7788
tseng7788
05.11.2022

Пошаговое объяснение:

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4,6(44 оценок)
Ответ:
gudroonnp010ou
gudroonnp010ou
05.11.2022

ответ:Сложим части

2+3+9=14

Чему равна 1 часть?

56:14=4

Чему равно первое число?

4•2=8

Второе?

4•3=12

Третье?

4•9=36

Проверка 8+12+36=56

ответ

2:3:9=8:12:36

в)

Сложим части

3/4+1,5+4=3/4+1 1/2+4=3/4+1 2/4+4=

5 5/4=6 1/4=25/4

Чему равна 1 часть?

12,5=12 5/10=12 1/2=25/2

25/2:25/4=2

Первое число 2•3/4=3/2=1 1/2

Второе число. 2•3/2=3

Третье число 2•4 =8

Проверка

1 1/2+3+8=12 1/2=12,5

ответ

3/4:1,5:4= 1/2:3:8

г) 4+11=15

240:15=16

Первое число

16•4=64

Второе число

16•11=176

Проверка

176+64=240

4:11=64:176

а)

сложим части

4/5+1 1/3=12/15+1 5/15=1 17/15=2 2/15=

32/15

7,2=7 2/10=7 1/5=36/5

Чему равна 1 часть?

36/5:32/15=54/16=3 3/8=27/8

Первое число

27/8•4/5=2 7/10

Второе число

27/8•4/3=9/2=4 1/2

Проверка

2 7/10+4 1/2=2 7/20+4 5/10=6 12/10=7 2/10=7,2

ответ

0,8:1 1/3=2 7/10:4 1/2

Пошаговое объяснение:

4,4(91 оценок)
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