Ответ:
Пошаговое объяснение:
1.
2х - 6 + 5 = 4х + 8
2х - 4х = 8 + 6 - 5
-2х = 9
х = 9 : (-2)
х = -4,5
3,7 - 2,6х + 7,8 = 40 - х
-2,6х + х = 40 - 3,7 - 7,8
-1,6х = 28,5
х = 28,5 : (-1,6)
х = -17,8125
2.
= 6mn - 4m + 4m = 6mn
= 15ab + 6a - 6a = 15ab
3.
a = 6*15 / 8
a = 90/8
a = 11,25
a = 13/2*5/8 : 3/4
a = 65/16 : 3/4
a = 65/16 * 4/3
a = 65/4 * 1/3
a = 65/12
a = 5. 5/12
1 . a ) 2(x - 3 ) + 5 = 4( x +2 ) ;
2x - 6 + 5 = 4x + 8 ;
4x - 2x = - 6 + 5 - 8 ;
2x = - 9 ;
x = - 9 : 2 ;
x = - 4,5 .
б ) 3,7 - 2,6( x - 3 ) = 5 (8 - 0,2x )
3,7 - 2,6x + 7,8 = 40 - x ;
- 2,6x + x = 40 - 3,7 - 7,8 ;
- 1,6x = 40 - 11,5 ;
- 1,6x =28,5 ;
x = 28,5 : ( - 1,6 ) ;
x = - 17,8125 .
2 . a ) - 2m( - 3n +2 )+ 4m = 6mn - 4m + 4m = 6mn ;
б ) - 3a( - 5b - 2 ) - 6a =15ab + 6a - 6a =15ab .
3 . a ) 6 : a = 8 : 15 ; a = ( 6*15 ): 8 = 45/4 =11 1/4 ;
б ) 13/2 : 3/4 = a : 5/8 ; a = ( 13/2 * 5/8 ): (3/4 ) = 65/12 = 5 5/12 .
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Answers & Comments
Ответ:
Пошаговое объяснение:
1.
2х - 6 + 5 = 4х + 8
2х - 4х = 8 + 6 - 5
-2х = 9
х = 9 : (-2)
х = -4,5
3,7 - 2,6х + 7,8 = 40 - х
-2,6х + х = 40 - 3,7 - 7,8
-1,6х = 28,5
х = 28,5 : (-1,6)
х = -17,8125
2.
= 6mn - 4m + 4m = 6mn
= 15ab + 6a - 6a = 15ab
3.
a = 6*15 / 8
a = 90/8
a = 11,25
a = 13/2*5/8 : 3/4
a = 65/16 : 3/4
a = 65/16 * 4/3
a = 65/4 * 1/3
a = 65/12
a = 5. 5/12
Ответ:
Пошаговое объяснение:
1 . a ) 2(x - 3 ) + 5 = 4( x +2 ) ;
2x - 6 + 5 = 4x + 8 ;
4x - 2x = - 6 + 5 - 8 ;
2x = - 9 ;
x = - 9 : 2 ;
x = - 4,5 .
б ) 3,7 - 2,6( x - 3 ) = 5 (8 - 0,2x )
3,7 - 2,6x + 7,8 = 40 - x ;
- 2,6x + x = 40 - 3,7 - 7,8 ;
- 1,6x = 40 - 11,5 ;
- 1,6x =28,5 ;
x = 28,5 : ( - 1,6 ) ;
x = - 17,8125 .
2 . a ) - 2m( - 3n +2 )+ 4m = 6mn - 4m + 4m = 6mn ;
б ) - 3a( - 5b - 2 ) - 6a =15ab + 6a - 6a =15ab .
3 . a ) 6 : a = 8 : 15 ; a = ( 6*15 ): 8 = 45/4 =11 1/4 ;
б ) 13/2 : 3/4 = a : 5/8 ; a = ( 13/2 * 5/8 ): (3/4 ) = 65/12 = 5 5/12 .