Question

11а-(7а-16б), якщо А+4б=-2,7​

Answer 1

$\displaystyle\bf\\a+4b=-2,7\\\\11a-(7a-16b)=11a-7a+16b=4a+16b=4\cdot\underbrace{(a+4b)}_{-2,7}=\\\\=4\cdot(-2,7)=-10,8$