Question

Ajuda com algumas equações!!

Answer 1

4
a)  x - 1/2 = 1 ==> 2x - 1 = 1==> 2x = 1+1==> 2x = 2==> x= 1
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b) x/3 + x/2 = 15    MMC = 6

2x+3x=90==> 5x = 90 ==> x = 18
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c) 3x/2  -  5x = - 7 ==> 3x -10x = - 14==>-7x=-14(-1)==>7x=14==> x = 2
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d) x/4 + 7 = x/2 + 5        mmc = 4

 x + 28 = 2x + 20==> 2x - x = 28-20==> x = 8
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e) x/2+x/4+x/2=4      mmc = 4

2x+x+2x=16==> 5x=16==>x = 16/5
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f)3x/4 - x/2= - 2        mmc= 4
 
3x - 2x = - 8 ==> x = - 8
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5
a) 3(x-1)+2(x-3)=6

3x-3+2x-6=6==> 5x= 6+9==> 5x = 15==> x= 3
================================================4
a)  x - 1/2 = 1 ==> 2x - 1 = 1==> 2x = 1+1==> 2x = 2==> x= 1
====================================================
b) x/3 + x/2 = 15    MMC = 6

2x+3x=90==> 5x = 90 ==> x = 18
====================================================
c) 3x/2  -  5x = - 7 ==> 3x -10x = - 14==>-7x=-14(-1)==>7x=14==> x = 2
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d) x/4 + 7 = x/2 + 5        mmc = 4

 x + 28 = 2x + 20==> 2x - x = 28-20==> x = 8
====================================================
e) x/2+x/4+x/2=4      mmc = 4

2x+x+2x=16==> 5x=16==>x = 16/5
==============================================
f)3x/4 - x/2= - 2        mmc= 4
 
3x - 2x = - 8 ==> x = - 8
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5
a) 3(x-1)+2(x-3)=6

3x-3+2x-6=6==> 5x= 6+9==> 5x = 15==> x= 3
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b)  4(x-2) – 3(x-1) = 48    4x – 8 – 3x + 3 = 48 ==> x = 48+5==>x= 53
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c) 15x – 5(2x-1) = 3(x-1) 15x – 10x + 5 = 3x – 3

5x-3x= -3-5 ==> 2x= -8 ==> x= - 2
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d) 10x – 5(x+1) = 20 10x -5x – 5 = 20

 5x=20+5==>5x=25==>x=5