Решение во вложении :)
а) х = 1,8
б) х = 18
в) x = 19
г) y = 5
д) х = 3
е) х = 0,1
Пошаговое объяснение:
а) 0,3 : 1,5 = х : 9
0,2 = х : 9
х = 9 * 0,2 = 1,8
Проверка:
0,3 : 1,5 = 1,8 : 9
0,2 = 0,2
--------------------
б) х : 1 = 4 :
х : = 4 *
х = * = = = 18
18 : 1 = 4 :
18 : = 4 *
* = 4 * 3
= 12
12 = 12
в) =
=
3 * (x - 10) = 28
x - 10 =
x = + 10 = + = = 19
* =
г) =
30 = 7 * (y - 1,2)
y - 1,2 =
y = + = + = + = = = 5
Провека:
= ( - ) *
= *
д) 0,2 : (х - 2) = : 2
: (х - 2) = :
: (х - 2) = *
x - 2 = :
х = * + 2 = 1 + 2 = 3
0,2 : (3 - 2) = : 2
0,2 : 1 = :
0,2 = *
е) 2 : 0,24 = 1 : (х + 0,06)
: = : (х + )
* = : (х + )
: (х + ) =
х + = :
х = * - = - = - = = = 0,1
2 : 0,24 = 1 : (0,1 + 0,06)
: = : 0,16
: = :
* = *
Решение во вложении :)
а) х = 1,8
б) х = 18
в) x = 19
г) y = 5
д) х = 3
е) х = 0,1
Пошаговое объяснение:
а) 0,3 : 1,5 = х : 9
0,2 = х : 9
х = 9 * 0,2 = 1,8
Проверка:
0,3 : 1,5 = 1,8 : 9
0,2 = 0,2
--------------------
б) х : 1
= 4 : 
х :
= 4 * 
х =
*
=
=
= 18
Проверка:
18 : 1
= 4 : 
18 :
= 4 * 
12 = 12
--------------------
в)
= 
3 * (x - 10) = 28
x - 10 =
x =
+ 10 =
+
=
= 19
Проверка:
--------------------
г)
= 
30 = 7 * (y - 1,2)
y - 1,2 =
y =
+
=
+
=
+
=
=
= 5
Провека:
--------------------
д) 0,2 : (х - 2) =
: 2
x - 2 =
: 
х =
*
+ 2 = 1 + 2 = 3
Проверка:
0,2 : (3 - 2) =
: 2
0,2 : 1 =
: 
0,2 =
* 
0,2 = 0,2
--------------------
е) 2
: 0,24 = 1
: (х + 0,06)
х +
=
: 
х =
*
-
=
-
=
-
=
=
= 0,1
Провека:
2
: 0,24 = 1
: (0,1 + 0,06)