Решите уравнения: 1) 3x + 1 = 0 2) x + 4 = 7x - 3 3) 4(5-x) = 7(3-2x) 4)2/5(10x-5) = 7 -...

Question

Решите уравнения:


1) 3x + 1 = 0
2) x + 4 = 7x - 3
3) 4(5-x) = 7(3-2x)
4)2/5(10x-5) = 7 - (6x+1)
5) 8 - x/3 = x + 4/4
6) 2x - 3/5 + 4x + 5/3 = 5x - 7/2

Answer 1

1) 3х+1=0
3х=0+1
3x=0
x=0
2)х+4=7х-3
х-7х=-3-4
-6х=-7
х=7/6
3)4 (5-х)=7 (3-2х)
20-4х=21-14х
-4х+14х=21-20
10х=1
х=1/10
4)2/5 (10х-5)=7-(6х+1)
4х-2=7-6х-1
4х+6х=7-1+2
10х=8
х=4/5
5)8-х/3=х+4/4
8-х/3=х+1
24-х=3х+3
-х-3х=3-24
-4х=-21
х=21/4
6)2х-3/5+4х+5/3=5х-7/2
6х+16/15=5х-7/2
6х-5х=-7/2-16/15
х=137/30