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2010-02-28T18:01:30+01:00
A)
X+12=4
X=4-12
X=-8

B)
27-X=35
27-35=X
X=-8

C)
18+X=7
X=7-18
X=-11

D)
-19+X=20
X=20+19
X=39

E)
-3X-5+12X-6=4X-8X-15
9X-11=-4X-15
9X+4X=-15+11
13X=-4 |:13
X=-4/13

F)
2X+6-8X+12=24+4X
-6X+18=24+4X
-6X-4X=24-18
-10X=6 |:-10
X=-0,6
2010-02-28T18:03:59+01:00
A)

x+12=4
x= 4-12
x= -8

b)
27-x=35
-x=35-27
-x = 8 / -1
x= -8

c) 18+x=7
-x=7-18
-x= -11 / -1
x= 11
d) -19+x=20
x=20 +19
x= 39
e) -3x-5+12x-6=4x-8x-15
-3x+12x-4x+8x=-15+6+5
17x=4 / 17
x= 4/17
f) 2x+6-8x+12=24+4x

2x-8x-4x=24-12-6
-10x=6 / -10
x= -6/10 ( minus sześć dziesiątych )
2010-02-28T18:07:59+01:00
A x=-8
B x=-8
C x=-11
D x=39
E 9x-11=-4x-15
9x = -4x-4
13x=-4
x= -4/13
F -6X+18=4x+24
-6x=4x+6
-10x=6
x=-0,6