Ж)1/2x: 5=16: 0,8; з)0,2: (x-2)=1/2: 2 1/2; и)2 - вопрос №2212407125160802212212223024179006 от umos 22.09.2021 11:31

Question

Математика: Ж)1/2x: 5=16: 0,8; з)0,2: (x-2)=1/2: 2 1/2; и)2 2/3: 0,24=1 7/9: (x+0,06);

umos · Answer

Ж) 1/2*x : 5 = 16 / 0,8 | * 4
1/2*x * 0.8 = 16 * 5
0.8/2*x = 80
0.4 * x = 80
x = 200
з) 0.2 /(x - 2) = 1/2 : 2 1/2
0.2/(x - 2) = 1/2 : 5/2
0.2/ (x - 2) = 1/2 * 2/5
0.2 / (x - 2) = 1/5
0.2 = 0.2 * (x - 2)
0.2 + 2 * 0.2 = 0.2*x
0.6 = 0.2*x
x = 3
и) 2 2/3 : 0.24 = 1 7/9 : (x + 0.06)
8/3 : 0.24 = 16/9 : (x + 0.06)
8/3 * (x + 0.06) = 16/9 * 0.24
8/3 x + 4/25 = 32/75
8/3 x = 32/75 - 4/25 | * 75
8 * 25 * x = 32 - 4 * 3
x = 20 / 200
x = 0.1