A )3(x+2)=2(x-7)
B)4( 2m-1) +3m=2(4m-1)-(2-m)
Soluções para a tarefa
Resposta:
a)3(×+2)=2(×-7)
3x+2=2x-7
3×-2×=-7-2
1×=-9
×=-9/1
×=-9
b)4(2m-1)+3m=2(4m-1)-(2-m)
8m-4+3m=8m-2-2-m
8m+3m-8m+m=-2-2+4
4m=0
m=4/0
m=0
Resposta:
A) x=-20
B) m=0
Explicação passo-a-passo:
A)3(x+2)=2(x-7)
3(x+2)=2(x-7)
3(x+2)
3x+3x2
3x+6
3(x+2)=2(x-7)
3x+6=2(x-7)
3(x+2)=2(x-7)
2(x-7)
2x-2x7
2x-14
3(x+2)=2(x-7)
3x+6=2x-14
3x+6-2x=2x-14-2x
3x+6-2x=-14
3x+6=2x-14
3x+6-2x=-14
3x+6-2x-6=-14-6
3x-2x=-14-6
3x+6=2x-14
3x-2x=-14-6
3x-2x
(3x-2)x
1x
x
3x-2x=-14-6
x=-14-6
3x-2x=-14-6
-14-6
-(14+6)
-20
3x-2x=-14-6
x=-20
Resposta
x=-20
B)4(m-1)+3m=2(4m-1)-2-m)
4(2m-1)+3m=2(4m-1)-(2-m
4(2m-1)
4x2m-4
8m-4
4(2m-1)+3m=2(4m-1)-(2-m)
8m-4+3m=2(4m-1)-(2-m)
4(2m-1)+3m=2(4m-1)-(2-m)
2(4m-1)
2x4m-2
8m-2
4(2m-1)+3m=2(4m-1)-(2-m)
8m-4+3m=8m-2-(2-m)
-4+3m=-2(2-m)
8m-4+3m=8m-2-(2-m)
-4+3m=-2-2+m
-2-2
-(2+2)
-4
-4+3m=-2-2+m
-4+3m=-4+m
3m=m
3m-m=m-m
3m-m=0
3m-m
3m-1m
(3-1)m
2m
3m-m=0
2m=0
2m÷2=0÷2
m=0÷2
2m÷2=0÷2
m=0
2m=0
m=0
Resposta
m=0