Y(-4)=32+6=38
y(-6)=72+6=78
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1) 220/128 + 350/256 = 220/128 + 175/128 = 395/128 = 3 11/128
2) 300/15 + 691/4 = 20 + 170 + 11/4 = 192 3/4
3) 111/40 + 561/6 = 2 31/40 + 93 3/6 = 95 31/40 + 20/40 = 95 51/40 = 96 11/40
4) 35/38 + 83/81 = (35*81+38*83)/(38*81) = 5989/3078 = 1 2911/3078
Решение во вложения……………?………..?…..
Решение
4sin∧2x + 4cosx - 1 = 0
4*(1 - cos∧2x) + 4 cosx - 1 = 0
4 - 4cos∧2x + 4cosx - 1 = 0
4cos∧2x - 4cosx - 3 = 0
D = 16 + 4*4*3 = 64
1) cosx = (4 - 8) / 8 = -1/2
cosx = -1/2
x = (+ -) arccos(-1/2) + 2πn, n∈Z
x = (+ -) (π - π/3) + 2πn, n∈Z
x =( + -)(2π/3) + 2πn, n∈Z
2) cosx = (4 + 8 ) / 8 = 3/2 не удовлетворяет области определения функции y = cosx ( -1 ≤ cosx ≤ 1)