Question

Repedee,va rogg,dau coroanaa​

Answer 1

Răspuns:

1.a)3x + 12=0 <=> 3x= -12 <=> x = -12/3

b) 4x-5=0<=> 4x=5 <=> x=5/4

2.a) 2x-3=0 <=> 2x=3 <=> x=2/3

b) radical din 7 x -2 =0 <=> radical din 7 x =  2 <=> x= 2/ radical din 7

3. la a nu mai stiu, am o varsta, si nu imi mai aduc nici eu aminte tot

b)

$\frac{3}{4} x - 5\sqrt{7} = 0 <=> \frac{3}{4} x - \frac{20\sqrt{7} }{4} = 0 <=> 3x- 20 \sqrt{7} = 0 <=> 3x = 20\sqrt{7} <=> x= \frac{20\sqrt{7} }{3}$

4. a ) 4x+a = 2x +3 <=> 4x-2x=3-a <=>2x= 3-a <=> 2 x=3+2 <=> 2x =5 <=> x=5/2

5.

$\frac{x-2}{3} + \frac{x+1 }{2} =1\\inmultim fiecare fractie : prima o inmultim cu 2 , a doua cu 3\\ne rezulta => 2(x-2) + 3(x+1) =1 <=> 2x-4 + 3x + 3 =1 <=> 5x -1 = 1 <=> 5x = 1+1 <=> 5x=2 <=> x=2/5$

6.a+b=300

b=5a

a+5a=300

6a=300

a=300:6

a=50

b=5x50=250