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Vlad1287
a fost răspuns

Determinati solutiile ecuatiilor: a)7x+4+2(x-5)=8(x+1).........b)2(x+3)-5(2x+1)=12x-19

Răspuns :

7x+4+2(x-5)=8(x+1)
7x+4+2x-10=8x+1
9x-6=8x+1
9x-8x=6+1
x=7
S={7}
 2(X+3)-5(2X-1)=12X-19
2X+6-10X+5=12X-19
-8X+11=12X-19
11+19=8X+12X
30=20X
X=30:20
X=1,5
S={1,5}
a) 7x+4+2x-10=8x+8
 x=7
b)2x+6-10x+5=12x-19
11+19=12x+8x
x=1,5

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