popsky
幼苗
共回答了14个问题采纳率:100% 举报
1.
若x = 1,则y = 0;
若y = 1,则x = -1/2;
所以正整数解有0个.
2.
a 不等于-2,b不等于1.(这个题干不清晰.)
3.
2m - 1 = 1,3n - 2 = 1;
解得:m = 1,n = 1.
4.
3/x - 2/y = 1
等号两边同乘 xy
3y - 2x = xy
3y - xy = 2x
(3 - x)y = 2x
y = (2x)/(3-x)
5.
令 x = 1,代入得 y = 8;
令 x = 2,代入得 y = 13/2;
令 x = 3,代入得 y = 5;
令 x = 4,代入得 y = 7/2;
令 x = 5,代入得 y = 2;
令 x = 6,代入得 y = 1/2;
令 x = 7,代入得 y = -1;
综上:
所求方程的正整数解为:
x = 1,y = 8;或
x = 3,y = 5;或
x = 5,y = 2.
1年前
10