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nam
9 tháng 12 2016 lúc 21:18

x(y+2)+3y =6

=>x(y+3)+3y+9=15

=>x(y+3)+3(y+3)=15

=>(x+3)(y+3)=15

mả .....=......=>ta co bang sau

DƯƠNG KIM GIA HUY
4 tháng 11 lúc 19:06

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A Nguyễn
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Nhan Tran
16 tháng 2 2022 lúc 19:54

Ai 2k9 ko

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nguyen duc thang
9 tháng 1 2018 lúc 22:33

a ) Vì ( 2x + 1 ) . ( y - 3 ) = 10

=> 2x + 1 và y - 3 thuộc Ư ( 10 ) = { 1 ; 2 ; 5 ; 10 }

Mà 2x là số chẵn => 2x + 1 là số lẻ => 2x + 1 thuộc { 1 ; 5 }

Lập bảng giá trị tương ứng x , y :

2x + 115
x02
y - 3102
y135

Vậy ( x , y ) = ( 0 ; 13 ) ; ( 2 ; 5 )