3,5*(2 ¹/₇ - 1¹/₅) =
=3,5*(¹⁵/₇ - ⁶/₅)=
=<u>35 </u>* (<u>15*5-6*7</u>) =
10 35
=<u>33 </u>= 3,3
10
Решение:
x^3 - <u>x^2</u> +1 - х + x^3 + <u>x^2</u> + 6 + 1 = 8
2x^3 + 8 - x - 8 = 0
2x^3 - x = 0
x (2x^2 - 1) = 0
x1 = 0
x2 = корень из 1/2
А^2 - b^2 + 3( a - b )^2 = ( a - b )( a + b ) + 3( a - b )^2 = ( a - b )( a + b + 3a - 3b ) = ( a - b )( 4a - 2b )
При х = 6
4/18 = 9 - 1/12
4/18 = 8/12
1/9 = 4/3
при х = 8
4/24 = 9 -1/16
4/24 = 8/16
1/3 = 1/4