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Lilit245
@Lilit245
July 2022
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СРОЧНО ПЖЛ ДАМ 30 БАЛЛОВ
№1.
1) 4(x-6)=x-9
2) 6-3(x+1)=7-2
3) (8x+3)-(10x+6)=9
4) 3,5-x=8(x+2,8)
5) 0,3(6-2y)=4,5-0,7(y+9)
6) 3/5(7/9x-1/3)=x-2(целых)1/3
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jekadva
1)
4(x-6)=x-9
4x-24=x-9
4x-x=-9+24
3x=15
x=15:3
x=5
2)
3)
(8x+3)-(10x+6)=9
8x+3-10x-6=9
-2x-3=9
-2x=9+3
-2x=12
x=-12:2
x=-6
4)
3,5-x=8(x+2,8)
3,5-x=8x+22,4
-x-8x=22,4-3,5
-9x=18,9
x=-18,9:9
x=-2,1
5)
0,3(6-2y)=4,5-0,7(y+9)
1,8-0,6y=4,5-0,7y-6,3
1,8-0,6y=-1,8-0,7y
-0,6y+0,7y=-1,8-1,8
0,1y=-3,6
y=-36
6)
3/5(7/9x-1/3)=x-2(целых)1/3
7/15x - 1/5 = x - 2 1/3
x - 7/15x = 2 1/3 - 1/5
8/15x = 2 5/15 - 3/15
8/15x = 2 2/15
x= 32/15 * 15/8
x=4
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Answers & Comments
4(x-6)=x-9
4x-24=x-9
4x-x=-9+24
3x=15
x=15:3
x=5
2)
3)
(8x+3)-(10x+6)=9
8x+3-10x-6=9
-2x-3=9
-2x=9+3
-2x=12
x=-12:2
x=-6
4)
3,5-x=8(x+2,8)
3,5-x=8x+22,4
-x-8x=22,4-3,5
-9x=18,9
x=-18,9:9
x=-2,1
5)
0,3(6-2y)=4,5-0,7(y+9)
1,8-0,6y=4,5-0,7y-6,3
1,8-0,6y=-1,8-0,7y
-0,6y+0,7y=-1,8-1,8
0,1y=-3,6
y=-36
6)
3/5(7/9x-1/3)=x-2(целых)1/3
7/15x - 1/5 = x - 2 1/3
x - 7/15x = 2 1/3 - 1/5
8/15x = 2 5/15 - 3/15
8/15x = 2 2/15
x= 32/15 * 15/8
x=4