Răspuns :
a)9x-18=63 9x=63+18 9x=81 x=9
b)5x+15=10x-10 5x= 25 x=5
c)8x+2=10x-14 2x= 16 x=8
d)-2x+ 10=24x+74 -26x=64 x= 64 supra -26 si mai simplifici
e)-15x-30=21 -15x= 51 x= 51 supra -15
f)(5x-10) - (7x+21)+35= 0 -2x-31+35= 0 -2x=-4 x=2
si restul le fac cand viu de la magazin scuze
b)5x+15=10x-10 5x= 25 x=5
c)8x+2=10x-14 2x= 16 x=8
d)-2x+ 10=24x+74 -26x=64 x= 64 supra -26 si mai simplifici
e)-15x-30=21 -15x= 51 x= 51 supra -15
f)(5x-10) - (7x+21)+35= 0 -2x-31+35= 0 -2x=-4 x=2
si restul le fac cand viu de la magazin scuze
a)9x-18=-63 b) 5x+15=10x-10
9x=-63+18 5x-10x=-10-15
9x= -45 -5x=-25
x=-45:9 x=-25:(-5)
x=-5 x=5
c)8x+2=10x-14 d)-2x-10=-24x-16+56
8x-10x=-14-2 -2x-10=-24x+40
-2x=-16 -2x+24x=40+10
x=-16:(-2) 22x=50
x=8 x=50/22
e)1-4·(-5x+10)=21 f)5x-10-7x-21+35=0
1+20x-40=21 -2x-31+35=0
20x-39=21 -2x+4=0
20x=21+39 -2x=-4
20x=60 x=-4:(-2)
x=60:20 x=2
x=3
g)(x+3)(x-7)=0
x·x-7x+3x-21=0
x²-4x-21=0
ai ajuns la delta ?
9x=-63+18 5x-10x=-10-15
9x= -45 -5x=-25
x=-45:9 x=-25:(-5)
x=-5 x=5
c)8x+2=10x-14 d)-2x-10=-24x-16+56
8x-10x=-14-2 -2x-10=-24x+40
-2x=-16 -2x+24x=40+10
x=-16:(-2) 22x=50
x=8 x=50/22
e)1-4·(-5x+10)=21 f)5x-10-7x-21+35=0
1+20x-40=21 -2x-31+35=0
20x-39=21 -2x+4=0
20x=21+39 -2x=-4
20x=60 x=-4:(-2)
x=60:20 x=2
x=3
g)(x+3)(x-7)=0
x·x-7x+3x-21=0
x²-4x-21=0
ai ajuns la delta ?