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35 x 12 - 15 x 28 + \(\frac{2323}{4949}-\frac{23}{49}\)+ 2010
= (420 - 420 )+ \(\left(\frac{23}{49}-\frac{23}{49}\right)\)+ 2010
= 0 + 0 + 2010 = 2010 .
35 x 12 -15 x28+2323/4949-23/49+2010
=35x12-15x28+23/49-23/49+2010
=420-420+0+2010
=0+0+2010
=2010
a) \(\frac{2005\cdot2006-1}{2006\cdot2004+2005}\)
\(=\frac{2004\cdot2006+2006-1}{2006\cdot2004+2005}\)
\(=1\)
b) \(27\left(\frac{171717}{272727}+\frac{373737}{363636}\right)\)
\(=27\left(\frac{17}{27}+\frac{37}{36}\right)\)
\(=27\cdot\frac{17}{27}+27\cdot\frac{37}{36}\)
\(=17+\frac{9\cdot3\cdot37}{9\cdot4}\)
\(=17+27,75=44,75\)
P/s : ko biết câu b có đúng ko nữa
27 x \(\left(\frac{171717}{272727}+\frac{373737}{363636}\right)\)
= 27 x \(\left(\frac{17}{27}+\frac{37}{36}\right)\)
= 27 x \(\frac{17}{27}\)+ 27 x \(\frac{37}{36}\)
= 17 + 27,75
= 44,75
Bài giải :
\(\frac{575757}{424242}\)= \(\frac{57}{45}\)
\(\frac{575757}{565656}\)= \(\frac{57}{56}\)
\(\frac{575757}{727272}\)= \(\frac{57}{72}\)
\(=>\) ( \(\frac{57}{45}\)+ \(\frac{57}{56}\)\(\frac{57}{72}\) ) x \(18\)\(=\)\(57\)
Hk tốt
\(A=\left(\frac{575757}{424242}+\frac{575757}{565656}+\frac{575757}{727272}\right)\times18\)
\(=\left(\frac{57\times10101}{42\times10101}+\frac{57\times10101}{56\times10101}+\frac{57\times10101}{72\times10101}\right)\times18\)
\(=\left(\frac{57}{42}+\frac{57}{56}+\frac{57}{72}\right)\times18\)
\(=57\left(\frac{1}{42}+\frac{1}{56}+\frac{1}{72}\right)\times18\)
\(=\frac{57}{18}\times18=57\)
\(\frac{121212+12121212-1212}{363636+36363636-3636}\)
\(=\frac{12.10101+12.1010101-12.101}{36.10101+36.1010101-36.101}\)
\(=\frac{12\left(10101+1010101-101\right)}{36\left(10101+1010101-101\right)}\)
\(=\frac{12}{12.3}\)
\(=\frac{1}{3}\)
Ta có: \(\frac{121212+12121212-1212}{363636+36363636-3636}\)
=\(\frac{12\times\left(10101+1010101-101\right)}{36\times\left(10101+1010101-101\right)}\)
=\(\frac{12}{36}\)
=\(\frac{1}{3}\)
= 18.( 36/72 - 23/92 )
=18. 1/4
= 9/2