tính nhanh :\(\frac{2006.125+1000}{2006.126-1006}\)
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\(\frac{2006.125+1000}{126.2005-888}=\frac{250750+1000}{252630-888}=\frac{125875}{125871}\)
\(\frac{2004.2006+1000}{2005.2006-1006}\)
\(=\frac{2004.2006+1000}{\left(2004+1\right).2006-1006}\)
\(=\frac{2004.2006+1000}{2004.2006+2006-1006}\)
\(=\frac{2004.2006+1000}{2004.2006+1000}\)
\(=1\)
\(\frac{2004x2006+1000}{2005x2006-1006}\)
=\(\frac{1000}{1x2006-1006}\)cùng giảm 2004 lần số 2006
=\(\frac{1000}{1000}=1\)
\(\frac{2006x125+1000}{126x2006-1006}=\frac{2006x125+1000}{125x2006-2006-1006}=\frac{2006x125+1000}{125x2006+1000}=1\)
=\(\frac{2006x125+1000}{125x2006+2006-1006}\)
=\(\frac{2006x125+1000}{125x2006+1000}\)
=1
\(\frac{2006\cdot125+1000}{126\cdot2006-1006}=\frac{2006\cdot\left(126-1\right)+1000}{126\cdot2006-1006}\)
\(=\frac{2006\cdot126-2006+1000}{126\cdot2006-1006}\)
\(=\frac{2006\cdot126-1006}{126\cdot2006-1006}\)
\(=1\)
\(\frac{2006x125+1000}{126x2006-1006}\)
\(=\frac{2006x125+1000}{\left(125+1\right)x2006-1006}\)
\(=\frac{2006x125+1000}{125x2006+1x2006-1006}\)
\(=\frac{2006x125+1000}{125x2006+2006-1006}\)
\(=\frac{2006x125+1000}{125x2006+1000}\)
\(=1\)
ạ) \(136.75+75.64=75.\left(136+64\right)=75.200=15000\)
b) \(\frac{2006.125+1000}{126.2005-880}=\frac{2005.125+125+1000}{125.2005+2005-880}=\frac{2005.125+1125}{125.2005+1125}=1\)
a) 136 . 75 + 75 . 64
= 75 . ( 136 + 64 )
= 75 . 200
= 15 000
\(\frac{2006\times125+100}{125\times200-880}=\frac{250850}{24120}\)
\(\frac{2006.125+1000}{2006.126-1006}=\frac{2006.125+1000}{2006.125+2006-1006}=\frac{2006.125+1000}{2006.125+1000}=1\)