Toán Lớp 6: (x-1).(y+2)=-7
Y/C: kẻ bảng nhs
gấp
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 6: (x-1).(y+2)=-7
Y/C: kẻ bảng nhs
gấp
Comments ( 2 )
(x – 1)(y + 2) = -7
<=>(x – 1) ; (y + 2) \in Ư(-7) = {\pm 1 ; \pm 7}
$\begin{array}{|c|c|c|}\hline x -1&-7&-1&1&7\\\hline x&-6&0&2&8\\\hline y + 2&-1&-7&7&1\\\hline \\\hline y&-3&-9&5&-1\\\hline \end{array}$
Vậy các cặp ( x ; y ) thỏa mãn yêu cầu đề bài là :
( – 6 ; – 3 ) ; ( 0 ; – 9 ) ; ( 2 ; 5 ) ; ( 8 ; – 1 )
(x-1)(y+2)
=-7
=-1.7=1.(-7)=7.(-1)=-7.1
Vậy ta có 4 trường hợp
TH1: x-1=-1→x=0; y+2=7→y=5
TH2: x-1=1→x=2; y+2=-7→y=-9
TH3: x-1=7→x=8; y+2=-1→y=-3
TH4: x-1=-7→x=-6; y+2=1→y=-1