Question

1) Resolvo as equações:
A)3(2×+6)+2(6×-1)=×+4
B)6(3×-9)+4(×-1)=3×+100
C)9(2×-1)+×=3+×
D)4(2×-9)+2(×+3)-×=2(×+20)
E)8(3×+4)-2(×-1)+3×=×+200
F)3×+3+4=×-1
-------------------
     2       3
G)4×+3+×=×+3
--------------------
     5    3   2
H)9×-7+4=×
----------------
     3      2
I)4×-10+×=×+3
-------------------
     2   3    5
J)9×-8+3=×-7
-------------------
    2        3

Answer 1

Olá,

Vamos lá,

A)3(2×+6)+2(6×-1)=×+4
6x + 18 +12x -2 = x + 4
6x+12x-x = 4 -18 +2
17x = -12
x = -12/17


B)6(3×-9)+4(×-1)=3×+100
18x - 54 +4x -4 = 3x + 100
18x +4x - 3x = 100 +54 + 4
19x = 158
x = 158/19


C)9(2×-1)+×=3+×
18x -9 + x = 3 + x
18x + x - x = 3 + 9
18x = 12
x = 12/18
x = 2/3


D)4(2×-9)+2(×+3)-×=2(×+20)
8x - 36 + 2x + 6 - x = 2x + 20
8x +2x - x - 2x = 20 +36-6
7x = 50
x = 50/7

E)8(3×+4)-2(×-1)+3×=×+200
24x + 32 - 2x + 2 + 3x = x + 200
24x - 2x + 3x - x = 200 - 32 - 2
24 x = 166
x = 166/24
x = 83/12




F)3×+3+4=×-1
3x -x = -1 - 3 - 4
2x = -8
x = -8/2
x = -4
-------------------
2 3
G)4×+3+×=×+3
4x + x - x = 3 - 3 
4x = 0
x = 0


--------------------
5 3 2
H)9×-7+4=×
9x - x = 7 - 4
8x = 3
x = 3/8


----------------
3 2
I)4×-10+×=×+3
4x + x - x = 3 + 10
4x = 13
x = 13/4

-------------------
2 3 5
J)9×-8+3=×-7
9x -x = -7 +8 - 3
8x = -2
x = -2/8
x = -1/4