3,7 +4,3= 8
16,24: 8 = 2,03
66,24-2,03 = 64,21
6,595+3,405=10
11,4 :10 = 1,14
28,6 + 1,14= 29,74
(2-√3)^2 *(7+4√3)+3√12*1/4 = (2-√3)² *(√3²+4√3+ 2²)+3√(3*4)*1/4 = ( 2-√3)²(2+√3)² + 6√3/4 = ((2-3)(2+√3))² + 3√3/2 = 4-3 + 3√3/2 = (2+3√3)/2
35115
7|х|-5|х|=13
2|х|=13
|х|=13/2
х1=13/2
х2=-13/2