Question

Rezolvati in Q ecuatiile : a) x+ 1/5 = - 7/8; b) 1/2 x + 5 = 1/3; c) 2/3 -5x = 4intregi1/3; d)3,2x=-0.4; e) -3(x-2) +5.2=4x f) 4/x=-5/6 , x nu este egal cu 0 g) 5x-4/3x+2 = 6/7 (x nu este egal cu -2/3) h) (2-3x) - (4-5x) = (x-3) + 2

Answer 1

1. x+1/5=-7/8⇔ x=-1/5-7/8⇔ x=-8/40-35/40=-43/40=-1,3/40
2. 1/2*x+5=1/3⇔ 1/2x=1/3-5⇔1/2x=-14/3 ⇔x=-14/3÷1/2⇔x=-14/3×2=-28/3=-9,/3
3. 2/3-5x=4,1/3⇔-5x=-2/3+4,1/3⇔-5x=3,2/3⇔x=3,2/3÷(-5)⇔x=3,2/3×1/5⇔x=11/3×1/5=11/15
4. 3,2x=-0,4⇔x=-0,4÷3,2=-4÷32=0,125
5. -3(x-2)+5,2=4x⇔-3x-2*-3+5,2=4x⇔-3x+6+5,2=4x⇔-3x+11,2=4x⇔11,2=4x+3x=7x⇔x=11,2/7=1,6
6. 4/x=-5/6⇔-5x=4*6⇔x=24÷(-5)=-4,8
7. exte 3x sau 4/3*x ?? ( o sa dau raspunsul in comentari)
8. (2-3x)-(4-5x)=(x-3)+2⇔2-3x-4+5x=x-3+2⇔-2+2x=x-1⇔2x-x=2-1⇔x=1