Помогите решить.1)2х+4(5+х)=242)4х+5х+3(3+х)=03)4(х+5)=5(х-2)4)5(4+х)-4(5-2х)=0

Question

Помогите решить.
1)2х+4(5+х)=24
2)4х+5х+3(3+х)=0
3)4(х+5)=5(х-2)
4)5(4+х)-4(5-2х)=0

Answer 1

2х+4*(5+х)=24
2х+4*5+4х=24
2х+20+4х=24
2х+4х=24-20
6х=4
х=4/6=2/3
проверка: 2*2/3+4*(5+2/3)=2*2/3+20+4*2/3=4/3+20+8/3=20+12/3=20+4=24
24=24

Comments

4х+5х+3*(3+х)=0
4х+5х+9+3х=0
4х+5х+3х=9
12х=9
х=9/12=3/4

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4*(х+5)=5*(х-2)
4х+20=5х-10
4х-5х=-10-20
-х=-30
х=30

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5*(4+х)-4*(5-2х)=0
20+5х-20+8х=0
13х=0
х=0

Answer 2

1. 2х+20+4х-24=0
6х-4=0
х=4÷6=0.6

2. 9х+9+3х=0
12х+9=0
х=-9÷12=-0.75

3. 4х+20-5х+10=0
-х+20+10=0
-х+30=0
х=-(-30)=30

4. 20+5х-20+8х=0
5х+8х=0
13х=0
х=0÷13=0