Question

1. Rezolvaţi ecuaţiile în R:
a) 4(x + 3) - 7x = 5(2 - x) + 18;
b) 5x - 7(x + 1) = 3(3 - 2x) + 8;
c)2(x + 3) + 5(1 - 2x) = 2 - x - 3(x + 1);
d) 3(x+4) – 5(2x + 1) = 4(x + 3) - 6(2x + 3) + 5.
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Answer 1

Răspuns:

a). 4x+12-7x=10-5x+18

-3x+12=-5x+28

-3x+5x=28-12

2x=16

x=8

b). 5x-7x-7=9-6x+8

-2x-7=-6x+17

-2x+6x=17+7

4x=24

x=6

c). 2x+6+5-10x=2-x-3x-3

-8x+11=-4x-1

-8x+4x=-1-11

-4x=-12

x=3

d). 3x+12-10x-5=4x+12-12x-18+5

-7x+7=-8x-1

-7x+8x=-1-7

x=-8

Explicație pas cu pas:

Answer 2

Răspuns:

Explicație pas cu pas:

1.  4x+12-7x=10-5x+18;

-3x+5x=28-12;

2x=16;x=8

2.    5x-7x-7=9+6x+8;

-2x+6x=17+7;

4x=24;

x=6;

3.   2x+6+5-10x=2-x-3x-3;

--8x+x+3x=-1-11;

-4x=-12;

x=12/4;

x=3

4.   3x+12-10x-5=4x+12-12x-18+5;

x=-8