Odpowiedzi

2010-02-04T17:41:52+01:00
1) 2x-1/2(3x-2)=7/4-x
2x - 1,5x+1= 7/4-x
2x-1.5x+x=7/4 -1
1.5x= 3/4 /:1.5
x=


2)3x-2(1-2x)=0,5(3x+1,5)
3x-2+4x=1.5x+0.75
3x+4x-1.5x= 2 + 0.75
5.5x =2.75 /:5.5
x= 0.5

3) 3i1/3x+8=4i2/5x-8 /-8, -4i2/5x
3i1/3x- 4i2/5x=-8-8
2i11/15x=-16 /÷2i11/15
x=-5,85


4)x/2+x/4+x/5=x-1 /*20
10x+5x+4x=20x-20
-1x=-20 /: (-1)
x=20
3 3 3
2010-02-04T17:43:12+01:00
2x-1/2(3x-2)=7/4-x
2x-1,5x-1= 7/4 -x /+x, +1
2x+x-1,5x= 7/4 +1
1,5x=1i 7/4
x≈ 0,78

3x-2(1-2x)=0,5(3x+1,5)
3x-2+4x= 1,5+0,75 /+2
7x=4,25 /÷7
x≈ 0,67

3i1/3x+8=4i2/5x-8 /-8, -4i2/5x
3i1/3x- 4i2/5x=-8-8
2i11/15x=-16 /÷2i11/15
x=-5,85

x/2+x/4+x/5=x-1 /×20
10x+5x+4x=20x-20 /-20x
19x-20x=-20
-x=-20
x=20
6 3 6