1) a^2b+ab^2=ab(a+b)=4*5=20,
2) a^2+b^2=a^2+2ab+b^2-2ab=(a+b)^2-2ab=5^2-2*4=25-8=17.
1) а²b + ab² = ab(a +b) = 4 * 5 = 20.
2) a² + b² = (a + b)(a + b) = 5 * 5 = 25
2) a² + b² = (a + b)² - 2ab = 5² - 2 * 4 = 25 - 8 = 17.
1) a^2b+ab^2=ab(a+b)=4*5=20,
2) a^2+b^2=a^2+2ab+b^2-2ab=(a+b)^2-2ab=5^2-2*4=25-8=17.
1) а²b + ab² = ab(a +b) = 4 * 5 = 20.
2) a² + b² = (a + b)(a + b) = 5 * 5 = 25
1) а²b + ab² = ab(a +b) = 4 * 5 = 20.
2) a² + b² = (a + b)² - 2ab = 5² - 2 * 4 = 25 - 8 = 17.