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yanka123098
@yanka123098
July 2022
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1)5-2(x-1)=4-x 2)(7x+1)-(9x+3)=5 3)3,4+2у=7(у-2,3) 4)0,2(7-2у)=2,3-0,3(у-6) 5) 2\3(1\3х-1\2)=4х+2 1\2 Решите пожалуйста)))
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Sofikild
1)5-2(x-1)=4-x
5-2х-5=4-х
-2x+x=4-5+5
x=4
2)(7x+1)-(9x+3)=5
7x+1-9x-3=5
7x-9x=5-1+3
-2x=7
x=7:-2
3)3,4+2у=7(у-2,3)
3,4+2y=7y-2,3*7
3,4+2y=7y-16,1
2y-7y=-16,1-3,4
-5y=-19,5
y=-19,5:-5
y=3,9
4)0,2(7-2у)=2,3-0,3(у-6)
0,2*7-2y*0,2=2,3-0,3y+0,3*6
1,4-0,4y=2,3-0,3y+0,18
1,4-0,4y=2,48-0,3y
-0,4y+0,3y=2,48-1,4
-0,1y=1,08
y=1,08:-0,1
y=10,8
5) 2\3(1\3х-1\2)=4х+2 1\2
2/9*x-2/6=4x+5/2
2/9*x-4/1*x=5/2+2/6
2/9*x-36/9*x=15/6+2/6
-34/8*x=17/2
x=-17*9/2*34
x=9/4
x=2*1/4 или 2,25
2 votes
Thanks 1
Sofikild
Я старалась:)
амина388
тогда незнаю
амина388
Я как тебя зовут
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Report "1)5-2(x-1)=4-x 2)(7x+1)-(9x+3)=5 3)3,4+2у=7(у-2,3) 4)0,2(7-2у)=2,3-0,3(у-6) 5) 2..."
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Answers & Comments
5-2х-5=4-х
-2x+x=4-5+5
x=4
2)(7x+1)-(9x+3)=5
7x+1-9x-3=5
7x-9x=5-1+3
-2x=7
x=7:-2
3)3,4+2у=7(у-2,3)
3,4+2y=7y-2,3*7
3,4+2y=7y-16,1
2y-7y=-16,1-3,4
-5y=-19,5
y=-19,5:-5
y=3,9
4)0,2(7-2у)=2,3-0,3(у-6)
0,2*7-2y*0,2=2,3-0,3y+0,3*6
1,4-0,4y=2,3-0,3y+0,18
1,4-0,4y=2,48-0,3y
-0,4y+0,3y=2,48-1,4
-0,1y=1,08
y=1,08:-0,1
y=10,8
5) 2\3(1\3х-1\2)=4х+2 1\2
2/9*x-2/6=4x+5/2
2/9*x-4/1*x=5/2+2/6
2/9*x-36/9*x=15/6+2/6
-34/8*x=17/2
x=-17*9/2*34
x=9/4
x=2*1/4 или 2,25