z 8 str 23 cwiczenia
rozwiaz rownanie :
a) 4(x+3)=5x-19 b) 2(2m-3)+2m=5(3-m)+1
2. rozwiaz rownanie
a)1,2-1,9x=0,5(x+3)-0,3(x+5) b) ⅚(y-4)-⅓=¼(y+5)+½
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a) 4(x+3)=5x-19 b) 2(2m-3)+2m=5(3-m)+1
4x+12=5x-19 4m-6+2m=15-5m+1
4x-5x=-19-12 6m+5m=16+6
-x=-31/(-1) 11m=22/11
x=31 m=2
a)1,2-1,9x=0,5(x+3)-0,3(x+5) b) ⅚(y-4)-⅓=¼(y+5)+½
1,2-1,9x=0,5x+1,5-0,3x-2,5 ⅚y-20/6 -⅓=¼y+5/4+½
-1,9x-0,2x=-1.2-1 ⅚y-¼y= 20/6+5/4+½
-2,1x=-2,1/(-2.1) 10/12y-3/12y=40/12+15/12+6/12
x=1 7/12y=61/12:7/12
y=61/12*12/7
y=61/7=8i5/7
a) 4x+12=5x-19
4x-5x = -19 -12
-x = -31/:(-1)
x = 31
b) 4m-6+2m= 15 -5m+1
4m + 2 m +5m = 15 + 1 +6
11 m = 22/11
m = 2
a) 1,2-1,9 x = 0,5x +1,5-0,3x-1,5
-1,9 x-0,5x+0,3x = 1,5 - 1,5 -1,2
-2,1 x = -1,2/:(-2,1)
x =0,57
b) 5/6y-20/6 -1/3= 1/4y +5/4+1/2
5/6y -1/4y = 5/4 + 1/2 +20/6+1/3
10/12y - 3/12y = 1i3/12 +6/12 +3 i 4/12 +4/12
7/12 y = 4 i 17/12
7/12y = 5 i 5/12 /:7/12
y = 65/12 *12/7
y = 65/7
y = 9 i 2/7