Odpowiedzi

2010-03-17T13:31:43+01:00
A) -9(2+y)-3y+8=-2(4y+5)
-15-9y-3y+8=-8y-10
-9y-3y+8y=-10+15-8
-4y=-3/(-4)
y=3/4
b)3[2(x+2)]-12x=3(8-4x)
3(2x+4)-12x=24-12x
6x+12-12x=24-12x
6x-12x+12x=24-12
6x=12/6
x=2
c)7(1+3x):2+1=3(-3+2x)
(7+21x)/2+1=-9+6x
3,5+10,5x+1=-9+6x
10,5x-6x=-9-3,5-1
4,5x=-13,5/4,5
x=-3
d)(2-x):2+(x-4):2=(3x+5):2
1-1/2x+1/2x-2=1,5x+2,5
-1/2x+1/2x-1,5x=2,5-1+2
-1,5x=3,5/(-1,5)
x=-2,(3)
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