Question

1) Resolvo as equações:
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
H)9×-7+4=×
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     3      2
I)4×-10+×=×+3
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     2   3   5

Answer 1

B)6(3×-9)+4(×-1)=3×+100

18x-54+4x-4=3x+100

19x=158

x=158/19

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C)9(2×-1)+×=3+×
18x-9+x=3+x

18x=12

x=12/18

x=2/3

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D)4(2×-9)+2(×+3)-×=2(×+20)

8x-36+2x+6-x=2x+40

7x=70

x=10

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E)8(3×+4)-2(×-1)+3×=×+200

24x+32-2x+2+3x=x+200

28x=200-34

x=166/28

x=83/14

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H)9×-7+4=×

8x=3

x=3/8

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I)4×-10+×=×+3

4x=13

x=13/4