1) <span>Решение : </span>
<span>7x + 9 = 100 </span>
<span>7x = 100 -9 </span>
<span>x = 91: 7 </span>
<span>x = 13 </span>
B(b-2)^2+b^2(2-b)=b(b-2)^2-b^2(b-2)=b(b-2)(b-2-b)=2b(b-2)
ab^2+5a^2b=ab(b+5a)
1. 3-4,6а^2+4,1аb-3,3ab^2 + 5,2a^2 -1,4b^2a=3+0,6a^2 +4,1ab -4,7 a b^2
1
2. 3-4,6а^2+4,1аb-3,3ab^2 - 5,2a^2 -1,4b^2a=3-4,8a^2+4,1ab-4,7ab^2
1
Дальше не знаю ♀️