Tính nhanh :
\(\frac{2006\times125+1000}{126\times2005-888}\)
\(\frac{2006\cdot125+1000}{126\cdot2005-888}\)
Tính nhanh
Giúp mình với
\(\frac{\left(2005+1\right).125+1000}{\left(125+1\right).2005-888}\)
= \(\frac{2005.125+125+1000}{125.2005+2005-888}\)
= \(\frac{2005.125+1125}{125.2005+1117}\)
= \(\frac{250625+1125}{250625+1117}\)
= \(\frac{125875}{125871}\)
tính nhanh :
2006*125+1000
126*2005-888
\(\frac{2006\cdot125+1000}{126\cdot2005-888}=\frac{2005\cdot125+125+1000}{125\cdot2005+2005-888}=\frac{2005\cdot125+1125}{125\cdot2005+1117}\)
=> không tính nhanh được
\(\frac{125875}{125871}\)
Tính nhanh
\(\frac{2010\times125+1000}{126\times2010-1010}=\)
=\(\frac{2010x125+1000}{\left(125+1\right)x2010-1010}=\frac{2010x125+1000}{125x2010+2010-1010}=\frac{2010x125+1000}{2010x125+100}=1\)
k nha bạn
Tính nhanh 2006 x 123 + 1000 / 126 x 2005 - 888
\(\dfrac{2006\cdot125+1000}{126\cdot2005-888}\)
Tính nhanh
Ta có :
Tử số :
( 2005 + 1 ) . 125 + 1000
2005 . 125 + 125 + 1000
2005 . 125 +1125
Mẫu Số :
( 125 + 1 ) . 2005 - 888
125 . 2005 + 2005 - 888
125 . 2005 + 1117
Ta có phân số : \(\dfrac{2005\cdot125+1125}{125\cdot2005+1117}\) = \(\dfrac{1125}{1117}\)
Tính nhanh:
\(\frac{2006\cdot125+1000}{2005\cdot126-888}=?\)
= \(\frac{125875}{125871}\)= 1.000031779
2006 x 125 + 1000 / 126 x 2005 - 888
2006.125 + 1000 / 126. 2005 - 880 = ( 2005 + 1 ). 125 + 1000 / (125+1). 2005 - 880 =2005. 125 + 125 + 1000 / 2005. 125 + 2005 -880 =2005. 125 = 1125 / 2005 + 125 + 1125
Bài 2 : Tính nhanh
a, 15\(\dfrac{2121}{4343}\)+15*\(\dfrac{222222}{434343}\)
b, A=\(\dfrac{2006\cdot125+1000}{126\cdot2005-888}\)
\(a,=15\left(\dfrac{2121}{4343}+\dfrac{222222}{434343}\right)=15\left(\dfrac{21}{43}+\dfrac{22}{43}\right)=15\cdot1=15\)