Question

Dau coroana:
a)3x-3,84+2x=2x-1,235+x;
b)2x-3,14+x=x+12;
c)4x-2,15+3x=3x+7,85;
d)3x-12,25+2x+x=7,395-2x+0,35;

Answer 1

a)3x-3,84+2x=2x-1,235+x;
5x-3,84 = 3x-1,235;
5x-3x = - 3,84 - 1,235;
2x = - 5,079
x = - 5,079 : 2
x = - 2,5395
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b)2x-3,14+x=x+12;
3x-3,14 =x+12;
3x-x = 3,14 +12;
2x = 15,14;
x = 15,14 : 2;
x = 7,57.
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c)4x-2,15+3x=3x+7,85;
7x-2,15=3x+7,85;
7x-3x = 2,15+7,85;
4x = 10;
x = 10 : 4;
x = 2,5.
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d)3x-12,25+2x+x=7,395-2x+0,35;
6x-12,25=7,745-2x;
6x+2x = 12,25+7,745;
8x = 19,995;
x = 19,995 : 8;
x ≈ 2,4993