Rozwiąż i sprawdź rówanania
a) 7x - 9 = 4x - 39
b) 4x + 5 = 2x + 25
c) -6x - 6 = 26 + 2x
d) 17x - 100 = 13x + 240
e) -8x - 12 = 20 - 4x
f) -9x - 6 = x + 4
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a) 7x - 9 = 4x - 39
7x-4x=-39+9
3x=-30
x=-10
spr:
7*(-10)-9 = 4*(-10)-39
-70-9=-40-39
-79=-39
l=p
b) 4x + 5 = 2x + 25
4x-2x=25-5
2x=20
x=10
spr:
4*10+5 = 2*10+25
40+5=20+25
45=45
l=p
c) -6x - 6 = 26 + 2x
-6x-2x=26+6
-8x=32
x=-4
spr:
-6*(-4)-6 = 26 + 2*(-4)
24-6=26-8
18=18
l=p
d) 17x - 100 = 13x + 240
17x-13x=240+100
4x=340
x=85
spr:
17*85 -100 = 13*85 +240
1445-100 = 1105+240
1345=1345
l=p
e) -8x - 12 = 20 - 4x
-8x+4x = 20+12
-4x=32
x=-8
spr:
-8*(-8)-12 = 20 -4*(-8)
64-12=20+32
52=52
l=p
f) -9x - 6 = x + 4
-9x-x=4+6
-10x=10
x=-1
spr:
-9*(-1)-6 = -1+4
9-6 =3
3=3
l=p
prosze ;)
a)
7x - 9 = 4x - 39
7x-4x= -39+9
3x= -30
x= - 10
Spr.
L=7x - 9 = 7* (-10)-9= -70-9= -79
P= 4x - 39= 4*(-10)-39= -40-39= -79
L=P
b)
4x + 5 = 2x + 25
4x-2x= 25-5
2x=20
x=10
Spr.
L=4x+5=4*10+5=45
P=2x+25=2*10+25=45
L=P
c)
-6x - 6 = 26 + 2x
-6x-2x=26+6
-8x=32
x= -4
Spr.
L=-6*(-4)-6=24-6= -18)
P=26+2*(-4)=26-8= -18
L=P
d)
17x - 100 = 13x + 240
17x-13x= 240+100
4x= 340
x=85
Spr.
L=17x-100= 17*85-100=1445-100=1345
P=13x+240=13*85+240=1105+240=1345
L=P
e)
-8x - 12 = 20 - 4x
-8x+4x=20+12
-4x=32
x= -8
Spr.
L=-8x-12= -8*(-8)-12=64-12=52
P= 20-4*(-8)= 20+32=52
L=P
f)
-9x - 6 = x + 4
-9x-x=4+6
-10x=10
x= -1
Spr.
L=-9x-6= -9*(-1)-6= 9-6= 3
P=x+4= -1+4= 3
L=P