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DH
1
29 tháng 3 2016
vì x=6 nên x=6
thay vào ta có 3.6-6.y=6
=>18-6y=6
=>6y=18-6
=>6y=12
=>y=12:6
=>y=2
Vậy y=2 ; x=6
DH
3
5 tháng 2 2020
a.
xy + 3x - 2y - 6 = 5
=>x(y + 3) - 2(y + 3) = 5
=>(x - 2)(y + 3) = 5.
Vì x, y thuộc Z nên x - 2, y + 3 thuộc Z
=> x - 2, y + 3 thuộc ước nguyên của 5
Lập bảng :
| x - 2 | -5 | -1 | 1 | 5 |
| y + 3 | -1 | -5 | 5 | 1 |
| x | -3 | 1 | 3 | 7 |
| y | -4 | -8 | 2 | -2 |
Vậy ......
b. Làm tương tự câu a.
c. Ta có x + y = 3 và x - y = 15
Bài này là tổng hiệu của cấp 1, áp dụng cách làm đó thì ta được số lớn là x = (3 + 15) : 2 = 9
Số bé là y = 9 - 15 = -6
d. Ta có : |x| + |y| = 1
=>|x| = 1 - |y|
Vì |x|, |y| >= 0 và |x| = 1 - |y| nên 0 =< |x|, |y| =< 1
Vì x, y thuộc Z nên x = 0 thì y = 1 hoặc -1 và ngược lại y = 0 thì x = 1 hoặc -1
14 tháng 1
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TQ
0
ND
0
MT
26 tháng 6 2015
a)xy+3x=-2y-6
xy+3x-2y-6=0
x(y+3)-2(y+3)=0
(y+3)(x-2)=0
=>y+3=0 và x-2=0
y=-3 và x=2
3x-xy+x=6
3x+x-xy=6
4x-xy=6
x(4-y)=6
=> x và 4-y thuộc ước của 6
nếu x=3 thì 4-y=2, y=2
nếu x=2 thì 4-y=3, y=1
nếu x=1 thì 4-y=6, y=-2
nếu x=6 thì 4-y=1, y=3
nếu x=-3 thì 4-y=-2, y=6
nếu x=-2 thì 4-y=-3, y=7
nếu x=-1 thì 4-y=-6, y=10
nếu x=-6 thì 4-y=-1, y=5