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sashanikolaeva11
@sashanikolaeva11
July 2022
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Упростите выражение :
а-(2,4-а)-(5а-4,7)
Решите уравнение:
а) 7х-4=х-16
б) 5х+(3х-7)
в) 3у-(5-у)=9
г) 0,7+0,3(х+2)=0,4(х-3)
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Answers & Comments
ирэн79
А-(2,4-а)-(5а-4,7)=а-2,4+а-5а+4,7=-3а
+2,3
а)7х-4=х-16
7х-х=4-16
6х=-12
х=-12:6
х=-2
б)5х+(3х-7)=8х-7
в)3у-(5-у)=9
3у-5+у=9
4у=5+9
4у=14
у=14:4
у=3,5
г)0,7+0,3(х+2)=0,4(х-3)
0,7+0,3х+0,6=0,4х-1,2
0,3х-0,4х=-0,7-0,6-1,2
-0,1х=-2,5
х=-2,5:(-0,1)
х=25
5 votes
Thanks 4
nurdaaaulet96p7v4vg
1. а-2.4+а-5а+4.7
-3а+2.3
2. 7х-х=-16+4
6х=-12
х=-2
3. 5х+3х-7
8х-7
4. 3у-5+у=9
4у-5=9
4у=9+5
4у=14
у=3.5
5. 0.7+0.3х+0.6=0.4х-1.2
1.3+0.3х=0.4х-1.2
0.3х-0.4х=-1.2-1.3
-0.1х=-2.5
х=25
4 votes
Thanks 3
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Answers & Comments
+2,3
а)7х-4=х-16
7х-х=4-16
6х=-12
х=-12:6
х=-2
б)5х+(3х-7)=8х-7
в)3у-(5-у)=9
3у-5+у=9
4у=5+9
4у=14
у=14:4
у=3,5
г)0,7+0,3(х+2)=0,4(х-3)
0,7+0,3х+0,6=0,4х-1,2
0,3х-0,4х=-0,7-0,6-1,2
-0,1х=-2,5
х=-2,5:(-0,1)
х=25
-3а+2.3
2. 7х-х=-16+4
6х=-12
х=-2
3. 5х+3х-7
8х-7
4. 3у-5+у=9
4у-5=9
4у=9+5
4у=14
у=3.5
5. 0.7+0.3х+0.6=0.4х-1.2
1.3+0.3х=0.4х-1.2
0.3х-0.4х=-1.2-1.3
-0.1х=-2.5
х=25