4 x 11 x 3/4 x 9/121=
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=2x2/1x3 x 3x3/2x4x4/3x5 x ... x 11x11/10x12
=2x2x3x3x4x4x...x11x11/1x3x2x4x3x5x...x10x12
= 2x3x4x...x11)x(2x3x4x...x11)/(1x2x3x4x...x11)/(1x2x3x...x10)x(2x3x4x...x11)
=11x2/1x12
=22/12
=11/6
4/3x9/8x16/15x...x121/120=\(\dfrac{2^2}{1\cdot3}\)x\(\dfrac{3^2}{2\cdot4}\)x\(\dfrac{4^2}{3\cdot5}\)x...x\(\dfrac{11^2}{10\cdot12}\)=\(\dfrac{2}{3}\)x\(\dfrac{11}{10}\)=\(\dfrac{11}{15}\)
\(=\dfrac{3}{9}\cdot\dfrac{9}{11}\cdot\dfrac{22}{25}\cdot\dfrac{5}{7}\cdot\dfrac{7}{10}=\dfrac{3}{11}\cdot\dfrac{22}{25}\cdot\dfrac{5}{10}=3\cdot2\cdot\dfrac{1}{2}\cdot\dfrac{1}{5}=\dfrac{3}{5}\)
a,( 3/29 - 1/5 ) x 29/3
=(15/145-29/145)x29/3
=(-14/145)x29/3
=-406/435
=-14/15
b,4 x 11 x 3/4 x 9/121
=4 x 11 x 3x9/1x1x4x121
=1188/484
=59/242
k mk nha
A / ( 3/29 - 1/5 ) x 29/3 = -14/145 x 29/3 = -14/15 B/ 4 x 11 x 3/4 x 9/121 = (4 x 11) x ( 3/4 x 9/121 ) = 44 x 27/484 =27/11 xong rồi đó
dau . la nhan nha em
a) \(\left(\frac{3}{29}-\frac{1}{5}\right).\frac{29}{3}=\frac{29}{3}.\frac{3}{29}-\frac{1}{5}.\frac{29}{3}=1-\frac{29}{15}=\frac{-14}{15}\)
b)\(4.11.\frac{3}{4}.\frac{9}{121}\)
\(=\left(4.\frac{3}{4}\right).\left(11.\frac{9}{121}\right)\)
\(=3.\frac{9}{12}\)
\(=\frac{9}{4}=2\frac{1}{4}\)
\(1)\frac{12}{7}\times \frac{7}{4}+\frac{35}{11}:\frac{245}{121}\)
\(=3+\frac{35}{11}\times \frac{121}{245}\)
\(=3+\frac{11}{7}\)
\(= 3\frac{1}{7}(=\frac{22}{7})\)
Bài 2:
a, \(\dfrac{5}{23}\) \(\times\) \(\dfrac{17}{26}\) + \(\dfrac{5}{23}\) \(\times\) \(\dfrac{9}{26}\)
= \(\dfrac{5}{23}\) \(\times\) ( \(\dfrac{17}{26}\) + \(\dfrac{9}{26}\))
= \(\dfrac{5}{23}\) \(\times\) \(\dfrac{26}{26}\)
= \(\dfrac{5}{23}\)
b, \(\dfrac{3}{4}\) \(\times\) \(\dfrac{7}{9}\) + \(\dfrac{7}{4}\) \(\times\) \(\dfrac{3}{9}\)
= \(\dfrac{7}{12}\) + \(\dfrac{7}{12}\)
= \(\dfrac{14}{12}\)
= \(\dfrac{7}{6}\)
B=1x3/2x2x2x4/3x3x3x5/4x4x...x10x12/11x11
B=1x3x2x4x3x5x...x10x12/2x2x3x3x4x4x...x11x11
B=(1x2x3x...x10)x(2x3x5x...x12)/(2x3x4x...x11)x(2x3x4x...x11)
B=1x12/11x2
B=12/22
B=6/11
Vậy B = 6/11
4x 11 x 3/4 x 9/121 = ( 4x 3/4) x (11 x 9/121) = 3 x 9/11 = 27/11