1) x-2+3-7x=-6x+1
2)4-5a-10+4a=-a-6
3)14b-15b-y-y-10b=11b-2y
4)x-(x-(5x-7))=x-(x-5x+7)=x-x+5x-7=5x-7
5)13b-(9b-(c-b-9b)=13b-(9b-c+b+9b)=13b-9b+c-b-9b=-6b+c
<span>12a - 3b
при а= - 3/4, b= 5/6</span>
12·(-3/4) - 3·(5/6)= -(12·3)/4 - (3·5)/6= -9-(5/2)=-11,5
Q=14/7=2
b5=b1*q^(n-1)=7*2^(5-1)=7*16=112
Ответ: b5=112