Предмет: Математика, автор: qazwsx12988

Помогите решить уравнение

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Ответы

Автор ответа: Milena17
0
s:2,3=4,6
s=4,6·2,3
s=10,58
Проверка:
10,58:2,3=4,6
           4,6=4,6

9,88:(6,7-х)=2,6
6,7-х=9,88:2,6
6,7-х=3,8
х=6,7-3,8
х=2,9
Проверка:
9,88:(6,7-2,9)=2,6
         9,88:3,8=2,6
                  2,6=2,6

6,7·(7,9-у)=28,81
7,9-у=28,81:6,7
7,9-у=4,3
у=7,9-4,3
у=3,6
Проверка:
6,7·(7,9-3,6)=28,81
          6,7·4,3=28,81
            28,81=28,81

9,14z-(3,78z+2,87z)=12,45
9,14z-6,65z=12,45
2,49z=12,45
z=12,45:2,49
z=5
Проверка:
9,14·5-(3,78·5+2,87·5)=12,45
                    45,7-33,25=12,45
                             12,45=12,45
Автор ответа: saddatimov
0
a)  frac{s}{2.3} = 4.6\
s = 4.6 * 2.3\
s = 10.58\ 
b)  frac{9.88}{6.7-x} = 2.6\
9.88 =  2.6 * (6.7-x)\
17.42 - 2.6x = 9.88\
-2.6x = -7.54\
x = 2.9\
v) 6.7(7.9-y) = 28.81\
52.93 - 6.7y =  28.81\
-6.7y = -24.12\
y = 3.6\
g) 9.14z - (3.78z + 2.87z) = 12.45\
2.49z = 12.45\
z = 5
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