Ответ:
х+у=680
0,8х+1,1у=580
y=680-x
0,8x+1,1×(680-x)=0,8x+748-1,1x=-0,3x+748=580
-0,3x=580-748= -168
x= -168÷(-0,3)=560
y=680-560=120
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Ответ:
х+у=680
0,8х+1,1у=580
y=680-x
0,8x+1,1×(680-x)=0,8x+748-1,1x=-0,3x+748=580
-0,3x=580-748= -168
x= -168÷(-0,3)=560
y=680-560=120