Вычислите: 1.75 - 1 11/17* 51/56+ 0.75: (4- 1.2*(3.25- 1 1/12+ 6 2/3: 20)) (-0,1) в квадрате

(1.75-1 11//17*51//56+0.75: (4-1.2*(3.25-1 1//12+6 2//3: /(-0,1)^2=(1.75-28//17*51//56+0.75: (4-1.2*(3.25-1 1//12+6 2//3: /(-0.1)^2=(1.75-1.5+0.75: (4-1.2*(3.25-1 1//12+6 2//3: /(-0.1)^2=(0.25+0.75: (4-1.2*(3.25-1 1//12+6 2//3: /(-0.1)^2=(0.25+0.75: (4-1.2*(13//6+6 2//3: /(-0.1)^2=(0.25+0.75: (4-1.2*(13//6+20//3: /(-0.1)^2=(0.25+0.75: (4-1.2*(13//6+1///(-0.1)^2=(0.25+0.75: (4-1.2*2.5))/(-0.1)^2=(0.25+0.75: (4-3))/(-0.1)^2=(0.25+0.75)/(-0.1)^2=1/(-0.1)^2=1/0.01=100// - черта дроби 

х+19/ х-5 = -1

обе части умножим на (х-5)

х+19=-х+5

2х=5-19

х=-7

(b-3)(b+3)-3b(4-b)=(b-3)2-12b