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настя19910
@настя19910
August 2022
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Dимасuk
Verified answer
1) По свойству пропорции:
5(3y - 1) = 8(2y - 7)
15y - 5 = 16y - 56
15y - 16y = -56 + 5
-y = -51
y = 51
2) (2y - 1)/(3y +2) = 7/8
По свойству пропорции:
8(2y - 1) = 7(3y + 2)
16y - 8 = 21y + 14
16y - 21y = 14 + 8
-5y = 22
y = -4,4
3) 2(x - 5) + x(5 - 2) + 6 = 1 + 5x
2x - 10 + 3x + 6 - 1 - 5x = 0
5x - 5 - 5x = 0
-5 = 0 - неверное, значит, нет корней.
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sedinalana
1
(3y-1)/8=(2y-7)/5 /*40
15y-5=16y-56
16y-15y=-5+56
y=51
2
(2y-1)/(3y+2)=7/8
8(2y-1)=7*(3y+2)
16y-8=21y+14
21y-16y=-8-14
5y=-22
y=-22:5
y=-4,4
3
2(x-5)+x(5-2)+6=1+5x
2x-10+3x+6=1+5x
5x-5x=1+4
0=5
нет решения
0 votes
Thanks 0
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Answers & Comments
Verified answer
1) По свойству пропорции:5(3y - 1) = 8(2y - 7)
15y - 5 = 16y - 56
15y - 16y = -56 + 5
-y = -51
y = 51
2) (2y - 1)/(3y +2) = 7/8
По свойству пропорции:
8(2y - 1) = 7(3y + 2)
16y - 8 = 21y + 14
16y - 21y = 14 + 8
-5y = 22
y = -4,4
3) 2(x - 5) + x(5 - 2) + 6 = 1 + 5x
2x - 10 + 3x + 6 - 1 - 5x = 0
5x - 5 - 5x = 0
-5 = 0 - неверное, значит, нет корней.
(3y-1)/8=(2y-7)/5 /*40
15y-5=16y-56
16y-15y=-5+56
y=51
2
(2y-1)/(3y+2)=7/8
8(2y-1)=7*(3y+2)
16y-8=21y+14
21y-16y=-8-14
5y=-22
y=-22:5
y=-4,4
3
2(x-5)+x(5-2)+6=1+5x
2x-10+3x+6=1+5x
5x-5x=1+4
0=5
нет решения