A) 8×-5=35
B) 2(2×+2)=30
C) 8(3×-4)=60
D) 9×+8=80
E) 7(×+8)=80
F)5×+20=60
G)2×+10=50
COM CÁLCULO GENTE!
Soluções para a tarefa
Resposta:
Explicação passo a passo:
a.
8x-5=35
8x=35+5
8x=40
x=40/8
x=5
b.
2.(2x+2)=30
4x+4=30
4x=30-4
4x=26
x=26/4 [simplifica por 2]
x=13/2
c.
8(3x-4)=60
24x-32=60
24x=60+32
24x=92
x=92/24 [simplifica por 4]
x=23/6
d.
9x+8=80
9x=80-8
9x=72
x=72/9
x=8
e.
7(x+8)=80
7x+56=80
7x=80-56
7x=24
x=24/7
f.
5x+20=60
5x=60-20
5x=40
x=40/5
x=8
g.
2x+10=50
2x=50-10
2x=40
x=40/2
x=20
Resposta:
Explicação passo a passo:
A) 8×-5=35
"8x= 35+5"
"8x=40"
"x =40/8"
"x= 5"
____________
B) 2(2×+2)=30
4x+4= 30
4x= 30-4
4x=26
"x= 26/4 (:2)/(:2)
"x = 13/2"
_____________
C) 8(3×-4)=60
24x-32= 60
"24x= 60+32"
"24x=92 "
"x= 92/24 (:4)/(:4)
"x= 23/6"
_____________
D) 9×+8=80
"9x= 8080-8"
"9x= 72"
"x= 72/9"
"x =8"
___________
E) 7(x+8)=80
"7x+56=80"
"7x= 80-56"
"7x=24"
"x= 24/7"
___________
F)5×+20=60
"5x= 60-20"
"5x= 40"
"x =40/5"
"x= 8"
__________
G)2×+10=50
"2x=50-10"
"2x= 40"
"x= 40/2"
"x= 20"