1,2х+1,3-0,91=5,34
1,2х+2,09=5,34
1,2х=5,34-2,09
1,2х=3,25
х=65/24
х=2 17/24
х=2,70833
1.1)150•20=3000
2)843 900-3000=840 900
3)3670085-840 900=2 829 185
2.
1)430•20=8600
2)385 317+8 480 623=8 865 936
3)8 865 936-8 600=8 857 336
А - числитель; b - знаменатель
{ b = a+1
{ a/b + b/a = 2,05
a/(a+1) + (a+1)/a = 2,05
(a² + (a + 1)²)/(a(a + 1)) = 2,05
a² + a² + 2a + 1 = 2,05a(a + 1)
2a² + 2a + 1 = 2,05a² + 2,05a
1 = 0,05a² + 0,05a
a² + a - 20 = 0 D = b²-4ac = 1+80 = 81
a₁ = (-b+√D)/2a = 4 b₁ = a+1 = 5
a₂ = (-b -√D)/2a = -5 b₂ = -4
Ответ: {4/5}
2953560|326
2934 |9060
1956
1956
0