Toán (15×19-x-0,15) : 0,25= 15:0,25 2011×2010-1/2009×2011+2010 12/09/2021 By Melanie (15×19-x-0,15) : 0,25= 15:0,25 2011×2010-1/2009×2011+2010
a,(15 x 19 – x – 0,15) : 0,25 = 15 : 0,25 (15 x 19 – x – 0,15) : 0,25 = 60 15 x 19 – x – 0,15 = 60 x 0,25 = 15 15 x 19 – x = 15 + 0,15 = 15,15 285 – x = 15,15 x = 285 – 15,15 x = 269,85 b,(2011×2010-1) / (2009×2011+2010) = [2011 x (2009 + 1) – 1] / (2009 x 2011 + 2010) = [2011 x 2009 + (2011 x 1 – 1)] / (2009 x 2011 + 2010 = (2011 x 2009 + 2010) / (2009 x 2011 + 2010) = 1 Trả lời
(15 × 19 – `x` – 0,15) : 0,25 = 15 : 0,25 (15 × 19 – `x` – 0,15) : 0,25 = 60 15 × 19 – `x` – 0,15 = 60 × 0,25 15 × 19 – `x` – 0,15 = 15 15 × 19 – `x` = 15 + 0,15 15 × 19 – `x` = 15,15 285 – `x` = 15,15 ⇒ `x` = 296,85 $\dfrac{2011 × 2010 – 1}{2009 × 2011 + 2010}$$\dfrac{2011 × (2009 + 1) – 1}{2009 × 2011 – 2010}$ $\dfrac{2011 × 2009 + 2010}{2009 × 2011 – 2010}$ = 1 Trả lời
a,(15 x 19 – x – 0,15) : 0,25 = 15 : 0,25
(15 x 19 – x – 0,15) : 0,25 = 60
15 x 19 – x – 0,15 = 60 x 0,25 = 15
15 x 19 – x = 15 + 0,15 = 15,15
285 – x = 15,15
x = 285 – 15,15
x = 269,85
b,(2011×2010-1) / (2009×2011+2010)
= [2011 x (2009 + 1) – 1] / (2009 x 2011 + 2010)
= [2011 x 2009 + (2011 x 1 – 1)] / (2009 x 2011 + 2010
= (2011 x 2009 + 2010) / (2009 x 2011 + 2010)
= 1
(15 × 19 – `x` – 0,15) : 0,25 = 15 : 0,25
(15 × 19 – `x` – 0,15) : 0,25 = 60
15 × 19 – `x` – 0,15 = 60 × 0,25
15 × 19 – `x` – 0,15 = 15
15 × 19 – `x` = 15 + 0,15
15 × 19 – `x` = 15,15
285 – `x` = 15,15
⇒ `x` = 296,85
$\dfrac{2011 × 2010 – 1}{2009 × 2011 + 2010}$
$\dfrac{2011 × (2009 + 1) – 1}{2009 × 2011 – 2010}$
$\dfrac{2011 × 2009 + 2010}{2009 × 2011 – 2010}$
= 1