(x+5)(y+5)=125怎么做?

如题所述

(x+5)(y+5)=125
=-125×(-1)=(-1)×(-125) → x=-130,y=-6或x=-6,y=-130;
= (-25)×(-5)=(-5)×(-25) → x=-30,y=-10或x=-10,y=-30;
= (-15)×(-15) → x=y=-20;
= 15×15 → x=y=10;
= 5×25=25×5 → x=0,y=20或x=20,y=0;
=1×125=125×1 → x=-4,y=120或x=120,y=-4
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