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3(а-2) -(а+4) = 3а - 6 - а - 4 = 2а - 10
При а = -1,5 2а - 10 = 2*(-1,5) - 10 = -3 - 10 = -13
Ответ. -13
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Решение: По формуле преобразования произведения функций
<span>1. -4y-28=-44 </span>
<span>- 28 + 44 = 4у</span>
4у = 16
у = 4
2. <span> 0.5b-0.2=-5.7. </span>
<span>0.5b = -5.7 + 0.2</span>
<span>0.5b = -5.5</span>
<span>b= -11</span>
<span>3. <span> -0.6x-2.3=4.3</span></span>
-0.6x = 4.3 + 2.3
-0.6x = 6.6
x = -11
<span> 4. -7x-28=-3x-52</span>
<span>-7x + 3x = - 52 + 28</span>
10x = 24
x = 2.4
5. <span>0.9b-0.5=9.4</span>
<span>0.9b= 9.4 + 0.5</span>
<span>0.9b=9.9</span>
<span>b=11</span>
<span>6. </span><span><span>1-0.1d=2.1</span></span>
<span><span>-0.1d=2.1-1</span></span>
<span><span>-0.1d=1.1</span></span>
<span><span>d = -11</span></span>
:)
1)sin²x+sinx-1=0
sinx=a
a²+a-1=0
D=1+4=5
a=(-1-√5)/2 < -1 не подходит
a=(-1+√5)/2
sinx=(-1+√5)/2
x=arcsin(-0.5+√5/2)+2πn
2)cos²x-sin²x=0
cos2x=0
2x=-π/2+π*n
x=-π/4+π*n/2
3)√3cosx-sinx=0 :cosx
√3cosx/cosx-sinx/cosx=0
√3-tgx=0
tgx=√3
x=+-π/3+2π*n
4)sin7x-sin3x=0
2sin(7x+3x)/2*sin(7x-3x)/2=0
2sin5x*sin2x=0
sin2x=0
2x=πn
x=πn/2
sin5x=0
5x=π*n
x=π*n/5