16/04/11 17:02:41.98 4CHSc/8H.net
(70+5k)/k+(70+8k)/k=(70+20k)/k⇔k=10
(70+5x)/x=15⇔x=7
小学生、冷えてるか～？w
16/04/11 17:02:41.98 4CHSc/8H.net
(70+5k)/k+(70+8k)/k=(70+20k)/k⇔k=10
(70+5x)/x=15⇔x=7
小学生、冷えてるか～？w
16/04/11 17:02:41.98 4CHSc/8H.net
(70+5k)/k+(70+8k)/k=(70+20k)/k⇔k=10
(70+5x)/x=15⇔x=7
小学生、冷えてるか～？w