Question

42 БАЛЛА!
РЕШИТЬ МЕТОДОМ КАМЕРА!!​

Answer 1

$Delta =left|begin{array}{rrr}-3&5&2\4&-7&5\2&4&-3end{array}right|=-3(21-20)-5(-12-10)+2(16+14)=167ne 0\\\Delta _1=left|begin{array}{rrr}20&5&2\-13&-7&5\20&4&-3end{array}right|=20(21-20)-5(39-100)+2(-52+140)=501$

$Delta _2=left|begin{array}{rrr}-3&20&2\4&-13&5\2&20&-3end{array}right|=-3(39-100)-20(-12-10)+2(80+26)=835\\\Delta _3=left|begin{array}{rrr}-3&5&20\4&-7&-13\2&4&20end{array}right|=-3(-140+52)-5(80+26)+20(16+14)=334\\\x=frac{501}{167}=3; ,; ; y= frac{835}{167}=5; ; ,; ; z=frac{334}{167}=2\\Otvet:; ; x=3; ,; y=5; ,; z=2; .$