{5x-3(20-x)≥70,5x-3(20-x)≤90
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{5x-3(20-x)≥70,5x-3(20-x)≤90
![{5x-3(20-x)≥70,5x-3(20-x)≤90](/uploads/image/z/5002160-32-0.jpg?t=%7B5x-3%2820-x%29%E2%89%A570%2C5x-3%2820-x%29%E2%89%A490)
据题意,70≦5x-3(20-x)≦90
70≦8x-60≦90
130≦8x≦150
16.25≦x≦18.75
70≦8x-60≦90
130≦8x≦150
16.25≦x≦18.75
{5x-3(20-x)≥70,5x-3(20-x)≤90
4x-3x(20-x)=5x-7x(20-x)
4x-3x(20-x)=5x-7x(20-x)的解法
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
3≤|8-x| |x+1|>2-x |x+3|7|x+1| x^2-6|x|+9>0 |x-1|+|x+2|≥5
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
X+1-3X=5X+10 6-3X=5X-20
x/x-3-5x/x^2-x-6计算
4x^2-20x+18/x^2-5x+4≥3
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
5x-20*5=3x x=?