2x+5y

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2x+5y
2x+5y

2x+5y
由于y的系数比较大,从y写比较方便.
首先y<20,否则2x+5y>100
所以y从19开始
y=19时,2x<5,x=1或2
答案比较多,下面就列答案不写过程了：
y=18时,x是1到5
y=17时,x是1到7
y=16时,x是1到10
y=15时,x是1到12
y=14时,x是1到15
y=13时,x是1到17
y=12时,x是1到20
y=11时,x是1到22
y=10时,x是1到25
y=9时,x是1到27
y=8时,x是1到30
y=7时,x是1到32
y=6时,x是1到35
y=5时,x是1到37
y=4时,x是1到40
y=3时,x是1到42
y=2时,x是1到45
y=1时,x是1到47

5y<100
y<20
y=1，2x≤95，x=1,2,3,...,47
y=2，2x≤90，x=1,2,3,...,45
y=3，2x≤85，x=1,2,3,...,42
y=4，2x≤80，x=1,2,3,...,40
类推
... ...
y=19，2x≤5，x=1,2

5x(x-y)+2y(x-y) 化简:5(x-y)+2(x+y)-3(x-y) 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) （X+2Y)(5X-2Y) (x+2y)(5x-2y) 4x+2y-5x-y (2x-3y)-(5x-y) (2X-3y)-(5x-y) (x-y)^2+5(x-y)-14 (2x-5y)(3x+y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) (2x+y)²+(x+3y)(x-3y)-x(5x+8y)因式分解 [2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2 [(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)我急用 [(x+2y)(x-2y)-(2x-y)²+(3x-y(2x-5y)]/(-x)的解答 [(x+2y)^2-(x-y)(x+2y)-5y^2]÷(2y) 2x+5y 2(x-y)=5y,x-y=-5