x是A地区甲型的台数吧?
(1)y=1800x+1600(30-x)+1600(20-x)+1200x
=1800x+48000-1600x+32000-1600x+1200x
=80000-200x;
(2)x=28;y=74400;
x=29;y=74200;
x=30;y=74000;
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x是A地区甲型的台数吧?
(1)y=1800x+1600(30-x)+1600(20-x)+1200x
=1800x+48000-1600x+32000-1600x+1200x
=80000-200x;
(2)x=28;y=74400;
x=29;y=74200;
x=30;y=74000;
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,