tính nhanh:1988 + 2010 x 2011 / 2010 x 2012 – 22 29/10/2021 Bởi aikhanh tính nhanh:1988 + 2010 x 2011 / 2010 x 2012 – 22
Ta có: Mẫu số: $2010\times2012-22$ $=2010\times(2011+1)-22$ $=2010\times2011+2010\times1-22$ $=2010\times2011+2010-22$ $=2010\times2011+1988$ $=$ Tử số Vậy $\dfrac{1988+2010\times2011}{2010\times2012-22}=1$ Bình luận
Tử số : 1988 + 2010 x 2011 = 2010 x (2012 – 1) + 1988 = 2010 x 2012 – 2010 x 1 + 1988 = 2010 x 2012 – (2010 – 1988) = 2010 x 2012 – 22 – Vậy {1988 + 2010 × 2011} / {2010 × 2012 – 22} = {2010 × 2012 – 22} / {2010 x 2012 – 22} = 1 Bình luận
Ta có:
Mẫu số: $2010\times2012-22$
$=2010\times(2011+1)-22$
$=2010\times2011+2010\times1-22$
$=2010\times2011+2010-22$
$=2010\times2011+1988$
$=$ Tử số
Vậy $\dfrac{1988+2010\times2011}{2010\times2012-22}=1$
Tử số :
1988 + 2010 x 2011
= 2010 x (2012 – 1) + 1988
= 2010 x 2012 – 2010 x 1 + 1988
= 2010 x 2012 – (2010 – 1988)
= 2010 x 2012 – 22
– Vậy {1988 + 2010 × 2011} / {2010 × 2012 – 22}
= {2010 × 2012 – 22} / {2010 x 2012 – 22}
= 1