a₁=-2,4 d=0,8 a₄=?
a₄=a₁+3d==2,4+3*0,8=-2,4+2,4=0.
Ответ: a₄=0.
1. 150*2= 300 2. 100* 16= 1600. 3. 1600 плюс 300= 1900 4. 1900 делить на 100= 19( 1%). 5 19*5=95. 6. 1900-95=1805
Решение
1) (7 + √7)/3√7 = [(7 + √7)*√7] /[3√7*√7] = (7√7 + 7) / 21 = (√7 + 1) / 3
2) (c² - 2)/(c - √2) = [c - (√2)²] / (c - √2) = [(c - √2) * (c + √2)] / (c - √2) =
= c + √2
3) 12/7√6 = (12*√6) / (7*√6*√6) = (12√6)/(7 * 6) = 2√6/7
4) 5 / (√13 + √3) = [5* (√13 - √3)] / [ (√13 + √3) * (√13 - √3)] =
= [5* (√13 - √3)] / (13 - 3) = [5* (√13 - √3)] / 10 = (√13 - √3) / 2
30y-6y"+10-2y=47-6y"+2y+9y-3
30y-6y"+10-2y-47+6y"-2y-9y+3
21y-34=0
21y=34
y=1целая 13 дробная черта 21
<span>x² + 10х + 25 = (х + 5 )²
у² - 2у + 1 = ( у - 1)²
а³ +64 = ( a + 8) ( a²- 8a + 64)
b³ - 1 </span>= (b - 1) (b² + b +1)