Вопрос школьника по предмету Математика
y^2-4y+7
Доказать, что при любых значениях X , значение квадратного трехчлена положительно. СРОЧНО ПОМОГИТЕ
Ответ учителя по предмету Математика
у²-4y+7 =у²-2 *2*у+2² +3=(у-2)²+3 квадрат любого числа больше 0, и ещё +3,значит выражение будет положительным
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an octopus woke up one day
and noticed something straight away
One leg has vanished out of sight
it must have disappeared last night
The octopus was in distress
Without eight legs my life*s a mess
wallking *s going to be so tough
seven legs is Not enough
so he phoned up the dolphin Kate
and told his probem to his classmate
he knew his friend would help him out
that*s what friends do he had no doubt
Theree minutes later Kate was there
holding somethig with great care
she gave a smile and softly said
dear octopus I found your leg
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