3[x]+2[y]=16,4[x]-[y]=6,[a]是a的整数部分.求方程组的解
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![3[x]+2[y]=16,4[x]-[y]=6,[a]是a的整数部分.求方程组的解](/uploads/image/z/14326198-70-8.jpg?t=3%5Bx%5D%2B2%5By%5D%3D16%2C4%5Bx%5D-%5By%5D%3D6%2C%5Ba%5D%E6%98%AFa%E7%9A%84%E6%95%B4%E6%95%B0%E9%83%A8%E5%88%86.%E6%B1%82%E6%96%B9%E7%A8%8B%E7%BB%84%E7%9A%84%E8%A7%A3)
3[x]+2[y]=16,4[x]-[y]=6,[a]是a的整数部分.求方程组的解
3[x]+2[y]=16,4[x]-[y]=6,[a]是a的整数部分.求方程组的解
3[x]+2[y]=16,4[x]-[y]=6,[a]是a的整数部分.求方程组的解
先当成为[x],[y]的二元一次方程组,易解得:
[x]=28/11
[y]=46/11
因为[x],[y]为整数,上式28/11,46/11都不是整数
所以原方程组无解.
x=28/11
y=46/11
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610(x-y)=3(x+y)+156(x+y)=4(2x-y)+16
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610(x-y)=3(x+y)+156(x+y)=4(2x-y)+16分开的。
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
2(x-y)/3-(x+y)/4=-1 (1) 6(x+y)-4(2x-y)=16 (2)
解方程组2(x-y)/3-x+y/4=-1 6(x-y)-4(2x-y)=16
解方程组:2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16