(C₁₆³+C₁₅²+C₁₄¹)/(C₁₆⁴+C₁₅³+C₁₄²)
C₁₆³=16!/((16-3)!*3!)=13!*14*15*16/(13!*6)=3360/6=560
C₁₅²=15!/((15-2)!*2!)=15!/(13!*2)=13!*14*15/(13!*2)=210/2=105
C₁₄¹=14!/((14-1)!*1)=14!/(13!*1)=13!*14/13!=14
(C₁₆³+C₁₅²+C₁₄¹)=560+105+14=679.
C₁₆⁴=16!/((16-4)!*4!)=12!*13*14*15*16/(12!*24)=43680/24=1820
C₁₅³=15!/((15-3)!*3!)=12!*13*14*15/(12!*6)=2730/6=455
C₁₄²=14!/((14-2)!*2!)=12!*13*14/(12!*2)=182/2=91
C₁₆⁴+C₁₅³+C₁₄²=1820+455+91=2366
679/2366=97/338.
Ответ: 97/338.
<span>у=-3х+5
1) 8 = -3x+5
-3x = 3
x = -1
2) y = -3*(-1) +5
y = 3+5
y = 8
3) 2 = -3x +5
-3x = -3
x=1
5 = -3x +5
-3x = 0
x = 0 </span>
X + y + 1.1x + x×2/5 = 30 + 50 + 1.1×30 + 50 × 2/5 = 30 + 50 + 33 + 20 = 133