Răspunsuri

2014-11-12T16:49:43+02:00
A..2(x-1)=x+3 ⇒2x-2=x+3⇒2x-x=3+2⇒x=5
B..4(x-5)=20⇒4x-20=20⇒4x=20+20/ :4⇒x=5+5⇒x+10
C.. x-5/4= 1/2 ( se amplifica cu 4 la prima si cu 2 la cea dupa egal )⇒4x-5=2⇒4x=2+5⇒4x=7⇒x=7/4
D..x+3/4=x+3/5( numitorul comun va fii 20)⇒20x+15=20x+12⇒0x=32
E..x-1/3=x/5( numitor comun=15)⇒15x-5=3x⇒12x= 5⇒x= 5/12
F..2(x-2)-3(1-x)=7⇒2x-4-3+3x=7⇒5x=14⇒x=14/5