Question

Bradoz prosze o zdrobienie tych zadan w załączniku
tyle ile umiesz

Answer 1

1) x+y=66
y-8=42%[x-8]
x=66-y
y-8=x-
y-+y=/·7
7y-198+3y=32
10y=32+198
10y=230
y=230÷10
y=23 -> lat syn
66-23=43-> lat tata

2)
x+y=46
x+10=2
x+y=46
x-2y=20-10
-x+2y=-10
y+2y=46-10
3y=36
y=12
x+12=46
x=34

3) nwm

4) 5x+2x=109
4(1,3x)+3(0,8y)=114
2y=109-5x/:2
5,2x+2,4y=114
y=54,5-2,5x
5,2x+2,4(54,5-2,5x)=114
y=54,5-2,5x
2,5x+130,8-6x=114
y=54,5-2,5x
-0,8x=114-130
y=54,5-2,5y
-0,8x=-16,8
y=54,5-2,5x
0,8x=16,8/:0,8
y=54,5-2,5x=21
y=54,5-2,5*21=21
y=54,5-42=21
y=12,5
x=21

5)
x+y=38
25(x-20%x)+20(y-10%y)=720

x+y=38
25(x-2/10x) + 20(y-1/10y)=720

x+y=38
25x-5x+20y-2y=720

x+y=38
20x +18y=720

x=38-y
20(38 - y)+18y=720
760-20y+18y=720
-2y=720-760
-2y=-40|:(-2)
y=20

x=38-y
x=38-20
x=18

liczę na naj :)