Odpowiedzi

2010-03-17T14:15:33+01:00
A) 17y+28=19y+27
28-27=19y-17y
1=2y/:2
0,5=y
SPR:
17*0,5+28=19*0,5+27
2,5+28=9,5+27
36,5=36,5

b) -9z-7=-z-6
-9z+z=-6+7
-8z=1/:(-8)
z=0,125
SPR:
-9*(-0,125)-7=-(-0,125)-6
1,125-7=0,125-6
-5,875=-5,875

c)-s+15=4s-14+
-s-4s=-14-15
-5s=-29/:(-5)
s=5,8
SPR:
-5,8+15=4*5,8-14
9,2=23,2-14
9,2=9,2

d)8k-19=-8k+19
8k+8k=19+19
16k=38/:16
k=2,357
SPR:
8*2,357-19=-8*2,357+19
19-19=-19+19
O=O