Ответ: 2√10
Объяснение:
√7×√63 - √27 ÷ √12=
=√441 - √27 ÷ √4 =
= 21 - 3÷2 =
= 39÷2 =
= 19,5
<span>x=(-2*y+8)/5</span>
<span>х=-2*y/5+8/5=-(2//5)*y+8/5</span>
<span>х=-(2//5)*y+(8//5)~~-0.4*y+1.6.</span>