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Cel mai inteligent răspuns!
2014-11-01T11:56:46+02:00
1. Aduci la același numitor
(6x+6+4x+8+3x+9)/12=0
13x+23=0
x=-23/13

2. 1.1(6)=105/90=7/4
7x/4-5(x+2)/2=5x-9
(7x-10x-20)/4=5x-9
-3x-20=20x-36
23x=16
x=16/23


3. 1.5-(x-1)/4=(2x+5-10x)/4
1.5=(5-8x+x-1)/4
6=4-7x
2=-7x
x=-7/2

4. 0.5+0.(5)=5/10+5/9=19/18
1-18/19•19/18+x=-100
1-1+x=-100
x=-100
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