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\(\frac{2006.2005-1}{2004.2006+2005}\)
\(=\frac{2006\left(2004+1\right)-1}{2004.2006+2005}\)
\(=\frac{2006.2004+2006-1}{2004.2006-2005}\)
\(=\frac{2006.2004+2005}{2004.2006+2005}=1\)
nha
\(\frac{21}{11}\)x \(\frac{22}{17}\)x\(\frac{68}{63}\)
= \(\frac{42}{17}\)x\(\frac{68}{63}\)
= \(\frac{8}{3}\)
18 - x : 2 = 16
x : 2 = 18 - 16
x = 2 x 2
x = 4
\(\frac{21}{11}\times\frac{22}{17}\times\frac{68}{63}\)
\(=\frac{21}{11}\times\frac{22\times68}{17\times63}\)
\(=\frac{21}{11}\times\frac{22\times4}{1\times63}\)
\(=\frac{21}{11}\times\frac{88}{63}\)
\(=\frac{21\times88}{11\times63}\)
\(=\frac{1\times8}{1\times3}\)
\(=\frac{8}{3}\)
\(18-x:2=16\)
\(x:2=18-16\)
\(x:2=2\)
\(x=2\times2\)
\(x=4\)
21/11 x 22/17x68/63 = 7 x 3 x 2 x 11 x 4 x 17 / 11 x 17 x 7 x 3 x 3 = 8 / 3
21/11 x 22/17x68/63
= 7x3x2x11x4x17 / 11x17x7x3x3
=8/3
5/14x7/13x26/25
=5x7x26 / 14x13x25
= 5x7x13x2 / 7x2x13x5x5
=1/5
a; \(\dfrac{21}{11}\) x \(\dfrac{22}{17}\) x \(\dfrac{68}{63}\)
= \(\dfrac{21\times11\times2\times17\times4}{11\times17\times21\times3}\)
= \(\dfrac{11\times17\times21}{11\times17\times21}\) x \(\dfrac{2\times4}{3}\)
= 1 x \(\dfrac{8}{3}\)
= \(\dfrac{8}{3}\)
b; \(\dfrac{5}{14}\) \(\times\) \(\dfrac{7}{13}\) x \(\dfrac{26}{25}\)
= \(\dfrac{5\times7\times2\times13}{7\times2\times13\times5\times5}\)
= \(\dfrac{5\times7\times2\times13}{5\times7\times2\times13}\) x \(\dfrac{1}{5}\)
= 1 x \(\dfrac{1}{5}\)
= \(\dfrac{1}{5}\)
cái này là 2 phép tính riêng biệt hay là gì hả bạn ?
1a) \(\frac{10}{11}:\frac{11}{3}=\frac{10}{11}.\frac{3}{11}=\frac{30}{121}\)
b) \(3,42:0,75.8,4-6,8\)
\(=4,56.8,4-6,8=38,304-6,8=31,504\)
2a) \(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}=\frac{21.22.68}{11.17.63}=\frac{7.3.2.11.17.4}{11.17.3.3.7}=\frac{2.4}{3}=\frac{8}{3}\)
b) \(\frac{5}{14}.\frac{7}{13}.\frac{26}{25}=\frac{5.7.26}{14.13.25}=\frac{5.7.13.2}{2.7.13.5.5}=\frac{1}{5}\)
\(\frac{10}{11}:1\frac{1}{3}\)
\(=\frac{10}{11}:\frac{4}{3}\)
\(=\frac{10}{11}\cdot\frac{3}{4}\)
\(=\frac{15}{22}\)
\(3,42:0,57\cdot8,4-6,8\)
\(=6\cdot8,4-6,8\)
\(=50,4-6,8\)
\(43,6\)
2.
\(\frac{21}{11}\cdot\frac{22}{17}\cdot\frac{68}{63}\)
\(=\frac{21\cdot22\cdot68}{11\cdot17\cdot63}\)
\(=\frac{21\cdot11\cdot2\cdot17\cdot4}{11\cdot17\cdot21\cdot3}\)
\(=\frac{̸21\cdot̸11\cdot2\cdot̸17\cdot4}{̸11\cdot̸17\cdot̸21\cdot3}\)
\(=\frac{8}{3}\)
\(\frac{5}{14}\cdot\frac{7}{13}\cdot\frac{26}{25}\)
\(=\frac{5\cdot7\cdot26}{14\cdot13\cdot25}\)
\(=\frac{̸5\cdot̸7\cdot̸13\cdot2}{̸7\cdot2\cdot̸13\cdot̸5\cdot5}\)
\(=\frac{2}{10}\)
a, 27.5 x 5.43 + 4.57 x 27.5
= 27.5 x ( 5.43 + 4.57 )
= 27.5 x 10
= 275
c,\(\frac{2006x2005-1}{2004x2006+2005}\)
= \(\frac{2006x\left(2004+1\right)-1}{2004x2006+2005}\)
= \(\frac{2006x2004+2006-1}{2004x2006+2005}\)
= \(\frac{2006x2004+2005}{2004x2006+2005}\)
= 1.
Mình chỉ biết từng nấy thôi.