8+4х...

September 2021 2 23 Report

При каком значении х равны значения выражений: а) х+3,2 и -3х; б) 3/4-х и 3/24-6х; в) х+1/15 и 7/30 и 2х; г) 0,2+3х и -1/8+4х

Inf777

Verified answer

А) х + 3,2 = - 3х
х + 3х = - 3,2
4х = - 3,2
х = - 3,2 : 4
х = - 0,8
-------------------------------
б) 3/4 - x = 3/24 - 6x
- x + 6x = 3/24 - 3/4
5x = 3/24 - 18/24
5x = - 15/24
5x = - 5/8
x = - 5/8 : 5
x = - 1/8
-------------------------------
в) x + 1/15 = 7/30
x = 7/30 - 1/15
x = 7/30 - 2/30
x = 5/30
x = 1/6
-------------------------------
г) 0,2 + 3х = - 1/8 + 4x
3x - 4x = - 1/8 - 2/10
- x = - 1/8 - 1/5
- x = - 5/40 - 8/40
- x = - 13/40
x = 13/40
-----------------------

1 votes Thanks 1

Mikle2005hru

Verified answer

а) х+3,2 = -3х
4х = -3,2
х = -0,8

б) 3/4-х = 3/24-6х
6х-х = 3/24 - 3/4
5х = 1/8 - 6/8
5х = - 5/8
х = - 1/8

в) х+1/15 = 7/30
х = 7/30 - 1/15
х = 7/30 - 2/30
х = 1/6

г) 0,2+3х = -1/8+4х
4х-3х = 0,2 + 1/8
х = 0,2 + 0,125
х = 0,325
х = 13/40

0 votes Thanks 0

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