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samuil777
@samuil777
August 2021
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Помогите 1033 очень прошу с проверкой
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Еленка28012
1)3х+8 1/6=12,2 проверка 3*1 31/90+8 1/6=12,2
3х+8 1/6=12 1/5
3х=12 1/5 - 8 1/6
3х=4 1/30
х=4 1/30 :3
х=1 31/90
2)10,5-4х=2 1/3 проверка 10,5 - 4*2 1/24=2 1/3
4х=10 1/2 - 2 1/3
4х=8 1/6
х= 8 1/6 :4
х=2 1/24
3)0,6х-3/7=11,4 проверка 0,6*19 5/7-3/7=11,4
3/5х-3/7=11 2/5
3/5х=11 2/5+3/7
3/5х=11 29/35
х=11 29/35 :3/5
х= 19 5/7
4)20х+15,4=21 проверка 20*7/25+15,4=21
20х=21 - 15 2/5
20х=5 3/5
х=5 3/5 :20
х=7/25
5)х :0,7=2/35 проверка 1/25 :0,7=2/35
х=2/35 * 7/10
х=1/25
6)2,5х=1/11 проверка 2,5*2/55=1/11
2 1/2х=1/11
х=1/11 :2 1/2
х=2/55
7)37-х:0,2=36 2/3 проверка 37-1/15:0,2=36 2/3
х:1/5=36 2/3-37
х:1/5=1/3
х=1/3*1/5
х=1/15
8)8х+89 2/9=90 проверка 8*7/72+89 2/9=90
8х=90-89 2/9
8х=7/9
х=7/9 : 8
х=7/72
1 votes
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Answers & Comments
3х+8 1/6=12 1/5
3х=12 1/5 - 8 1/6
3х=4 1/30
х=4 1/30 :3
х=1 31/90
2)10,5-4х=2 1/3 проверка 10,5 - 4*2 1/24=2 1/3
4х=10 1/2 - 2 1/3
4х=8 1/6
х= 8 1/6 :4
х=2 1/24
3)0,6х-3/7=11,4 проверка 0,6*19 5/7-3/7=11,4
3/5х-3/7=11 2/5
3/5х=11 2/5+3/7
3/5х=11 29/35
х=11 29/35 :3/5
х= 19 5/7
4)20х+15,4=21 проверка 20*7/25+15,4=21
20х=21 - 15 2/5
20х=5 3/5
х=5 3/5 :20
х=7/25
5)х :0,7=2/35 проверка 1/25 :0,7=2/35
х=2/35 * 7/10
х=1/25
6)2,5х=1/11 проверка 2,5*2/55=1/11
2 1/2х=1/11
х=1/11 :2 1/2
х=2/55
7)37-х:0,2=36 2/3 проверка 37-1/15:0,2=36 2/3
х:1/5=36 2/3-37
х:1/5=1/3
х=1/3*1/5
х=1/15
8)8х+89 2/9=90 проверка 8*7/72+89 2/9=90
8х=90-89 2/9
8х=7/9
х=7/9 : 8
х=7/72