907 a) (x2 + 3)(x - 7) = 0; 6) (3y - 1)(y2 + 1) = 0; B) (2 - 1)'(2 + 4) = 0; r) (3t + 12)(t + 2)2 = 0. 2 2
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485
Ответы на вопрос:
(3х + 4)(3х - 4) = (3х)² - 4² = 9х² - 16 (4х + 5)(4х + 5) = (4х + 5)² = (4х)² + 2*4х*5 + 5² = 16х² + 40х + 25 (2х - 3)(2х - 3) = (2х - 3)² = (2х)² - 2*2х * 3 + 3² = 4х² - 12х + 9 (2х + 1)(4х² - 2х + 1) = (2х + 1)( (2х)² - 2*х*1 + 1²) = (2х)³ + 1³ = 8х³ + 1 (х - 2)(х² + 2х + 4) = (х - 2)(х² + х*2 + 2²) = х³ - 2³ = х³ - 8 51² = (50 + 1)² = 50² + 2*50*1 + 1² = 2500 + 100 + 1= 2601 39² = (40 - 1)² = 40² - 2*40*1 + 1² = 1600 - 80 + 1 = 1521 103² = (100 + 3)² = 100² + 2*100*3 + 3² = 10000 + 600 + 9 = 10609 78² = ( 80 - 2)² = 80² - 2*80*2 + 2² = 6400 - 320 + 4 = 6084
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