Решите уравнения 1) 8x+5,2/24=11/2 2) 4/1,6=7x-2/10,2 3) x-0,2/0,8=4,2/1,2 4) 3x+0,8/9,6=4,8/3,6 5)5x+3/9=27/13,5 6) 8/20=28/9x+7 срочно дам 20 баллов
Ответы
1) 8х + 5,2 / 2,4 = 11/2;
8х + 13/6 = 11/2;
8х = 11/2 - 13/6;
8х = 10/3;
х = 10/3 : 8 = 10 * 1 / 3 * 8 = 10 / 24 = 5/12;
х: 5/12
2) 4*10,4=1.6*(7х-2);
4*6.5=7х-2;
26=7х-2;
7х=28;
х=4
3) х-0,2=0,8*4,2:1,2
х-0,2=3,36:1,2
х-0,2=2,8
х=2,8+0,2
х=3
4) 3х+0.8\9.6=4.8\3.6
3.6*(3х+0.8)=9.6*4.8
10.8х+2.88=46.08
10.8х=46.08-2.88
10.8х=43.2
х=43.2:10.8
х=4
5) 5х+3\9=27\13.5
13.5*(5х+3)=9*27
67.5х+40.5=243
67.5х=243-40.5
67.5х=202.5
х=202.5:67.5
х=3
6) 8(9x+7)=20*28
72x+56=560
72x=560-56
72x=504
x=504:72
x=7
Ответ:
1)
8х + 5,2 / 2,4 = 11/2;
8х + 13/6 = 11/2;
8х = 11/2 - 13/6;
8х = 10/3;
х = 10/3 : 8 = 10 * 1 / 3 * 8 = 10 / 24 = 5/12;
х = 5/12
2)
4*10,4=1.6*(7х-2);
4*6.5=7х-2;
26=7х-2;
7х=28;
х=4
3)
х-0,2=0,8*4,2:1,2
х-0,2=3,36:1,2
х-0,2=2,8
х=2,8+0,2
х=3
4)
3х+0.8\9.6=4.8\3.6
3.6*(3х+0.8)=9.6*4.8
10.8х+2.88=46.08
10.8х=46.08-2.88
10.8х=43.2
х=43.2:10.8
х=4
5)
5х+3\9=27\13.5
13.5*(5х+3)=9*27
67.5х+40.5=243
67.5х=243-40.5
67.5х=202.5
х=202.5:67.5
х=3
6)
8(9x+7)=20*28
72x+56=560
72x=560-56
72x=504
x=504:72
x=7