9x+4(50-x)≤360 3x+10(50-x)≤290 不要文字说明
问题描述:
9x+4(50-x)≤360 3x+10(50-x)≤290 不要文字说明
答
9x+4(50-x)≤360
9x+200-4x≤360
5x≤160
x≤32
3x+10(50-x)≤290
3x+500-10x≤290
20x≤-210
x≤-10.5
答
9x+4(50-x)9x+200-4x5x+2005x5xx3x+10(50-x)3x+500-10x-7x+500-7x-7xx>=30
所以30