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MirlaVenus
@MirlaVenus
December 2019
1
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1-Resolva
a-)2x-7/5=8x-3/5
b-)4x-7/2=5x/3
c-)x+4/15=2/3
d)x+4/3=x+3/4
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emicosonia
1-Resolva
a-)2x-7/5=8x-3/5
2x - 7 8x - 3
------- = ----------- ( só cruzar)
5 5
5(2x - 7 ) = 5(8x - 3)
10x - 35 = 40x - 15
10x - 35 - 40x = - 15
10x - 40x = - 15 + 35
- 30x = -20
x = - 20/-30
x = + 20/30 ( divide AMBOS por 10)
x = 2/3
b-)4x-7/2=5x/3
4x - 7 5x
-------- = ------ ( só cruzar)
2 3
2(5x) = 3(4x - 7)
10x = 12x - 21
10x - 12x = - 21
- 2x = - 21
x = - 21/-2
x = + 21/2
c-)x+4/15=2/3
x + 4 2
------- = ------- ( só cruzar)
15 3
3(x + 4) = 2(15)
3x + 12 =30
3x = 30 - 12
3x = 18
x = 18/3
x = 6
d)x+4/3=x+3/4
x + 4 x + 3
------- = -----------( só cruzar)
3 4
3(x + 3) = 4(x + 4)
3x + 9 = 4x + 16
3x + 9 - 4x = 16
3x - 4x = 16 - 9
- 1x = 7
x = 7/-1
x = - 7/1
x = - 7
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Lista de comentários
a-)2x-7/5=8x-3/5
2x - 7 8x - 3
------- = ----------- ( só cruzar)
5 5
5(2x - 7 ) = 5(8x - 3)
10x - 35 = 40x - 15
10x - 35 - 40x = - 15
10x - 40x = - 15 + 35
- 30x = -20
x = - 20/-30
x = + 20/30 ( divide AMBOS por 10)
x = 2/3
b-)4x-7/2=5x/3
4x - 7 5x
-------- = ------ ( só cruzar)
2 3
2(5x) = 3(4x - 7)
10x = 12x - 21
10x - 12x = - 21
- 2x = - 21
x = - 21/-2
x = + 21/2
c-)x+4/15=2/3
x + 4 2
------- = ------- ( só cruzar)
15 3
3(x + 4) = 2(15)
3x + 12 =30
3x = 30 - 12
3x = 18
x = 18/3
x = 6
d)x+4/3=x+3/4
x + 4 x + 3
------- = -----------( só cruzar)
3 4
3(x + 3) = 4(x + 4)
3x + 9 = 4x + 16
3x + 9 - 4x = 16
3x - 4x = 16 - 9
- 1x = 7
x = 7/-1
x = - 7/1
x = - 7