4567890ррла75596к6зе6еhttps://ppt-online.org/88192https://ppt-online.org/88192https://ppt-online.org/88192students by the end of the lesson will learn how to use noun suffixes and translate themhttps://ppt-online.org/88192students by the end of the lesson will learn how to use noun suffixes and translate themhttps://ppt-online.org/88192students by the end of the lesson will learn how to use noun suffixes and translate themhttps://ppt-online.org/88192students by the end of the lesson will learn how to use noun suffixes and translate themhttps://ppt-online.org/88192students by the end of the lesson will learn how to use noun suffixes and translate themhttps://ppt-online.org/88192
Пусть взято V литров спирта.После добавления V литров воды в сосуде стало 24-V литров спирта и V литров воды. При вторичном взятии V литров доля спирта составила V*(24-V)/24 литров. Всего взято V+V*(24-V)/24=(48*V-V²)/24 литров спирта. По условию, 24-(48*V-V²)/24=24*0,64=24*64/100, откуда (48*V-V²)/24=24-24*64/100 или 25*(48*V-V²)= 600*24-6*24*64, или 1200*V-25*V²=5184, или 25*V²-1200*V+5184=0.Дискриминант D=921600=960². Тогда V=(1200+960)/50=43,2 л либо V=(1200-960)/50=4,8 л. Но так как V<24 л, то V=4,8 л. ответ: 4,8 л.
4567890ррла75596к6зе6еhttps://ppt-online.org/88192https://ppt-online.org/88192https://ppt-online.org/88192students by the end of the lesson will learn how to use noun suffixes and translate themhttps://ppt-online.org/88192students by the end of the lesson will learn how to use noun suffixes and translate themhttps://ppt-online.org/88192students by the end of the lesson will learn how to use noun suffixes and translate themhttps://ppt-online.org/88192students by the end of the lesson will learn how to use noun suffixes and translate themhttps://ppt-online.org/88192students by the end of the lesson will learn how to use noun suffixes and translate themhttps://ppt-online.org/88192