设甲种X台、乙种Y台、丙种Z台,则得方程组:
X+Y+Z=50
1500X+2100Y+2500Z=90000
解得:Z=40-3Y/5
正整数解只有Y= 5,10,15,20,25.
从而Z=37,34,31,28,26.
X= 8,6,4 ,2,-1.
X、Y都应该是正整数,所以解有四种,即前四种
设甲种X台、乙种Y台、丙种Z台,则得方程组:
X+Y+Z=50
1500X+2100Y+2500Z=90000
解得:Z=40-3Y/5
正整数解只有Y= 5,10,15,20,25.
从而Z=37,34,31,28,26.
X= 8,6,4 ,2,-1.
X、Y都应该是正整数,所以解有四种,即前四种