Question

CLASA A 7 A | URGENT | DAU COROANĂ | NUMAI EX ÎNCERCUITE ​

Answer 1

Explicație pas cu pas:

17)

x = 1010 + 2 + 3 + 4 + ....+ 2018

x = 1010 + 2 • (1 + 2 + 3 + 4 + ....+ 1009)

x = 1010 + 2 • (1009 • 1010) : 2

x = 1010 + 1009 • 1010

x = 1010 • (1 + 1009)

x = 1010 • 1010

x = 1010² = patrat perfect

√x = √1010² = 1010

Answer 2

$\bf 17.\ \it x=1010+2(1+2+3+\ ...\ +1009)=1010+\not2\cdot\dfrac{1009\cdot1010}{\not2}=\\ \\ \\ =1010+1009\cdot1010=1010(1+1009)=1010\cdot1010=1010^2\\ \\ \\\sqrt{x}=\sqrt{1010^2}=1010$