Toán Lớp 6: x-3=y(x+2)
giải giair giúp minhf
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Toán Lớp 6: x-3=y(x+2)
giải giair giúp minhf
Comments ( 2 )
=>x+2-5=y(x+2)
=>x+2-5-y(x+2)=0
=>x+2 -y(x+2)=0+5
=>(x+2)-y(x+2)=5
=>(1-y)(x+2)=5
Ta có : 5=(-1).(-5)=(-5).(-1)=1.5=5.1
Ta có bảng sau :
$\begin{array}{|c|c|c|}\hline \text{x+2}&\text{-1}&\text{-5}&\text{1}&\text{5}\\\hline \text{1-y}&\text{-5}&\text{-1}&\text{5}&\text{1}\\\hline \text{x}&\text{-3}&\text{-7}&\text{-1}&\text{3}\\\hline \text{y}&\text{6}&\text{2}&\text{-4}&\text{0}\\\hline \end{array}$
Vậy (x;y)∈{(-3;6);(-7;2);(-1;-4);(3;0)}