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\(\frac{21}{11}\cdot\frac{22}{17}\cdot\frac{68}{63}=\frac{21\cdot22\cdot68}{11\cdot17\cdot63}\)=\(\frac{1\cdot2\cdot4}{1\cdot1\cdot3}=\frac{8}{3}\)
\(\frac{5}{14}\cdot\frac{7}{13}\cdot\frac{26}{25}=\frac{5\cdot7\cdot26}{14\cdot43\cdot25}\)=\(\frac{1\cdot1\cdot2}{2\cdot1\cdot5}\)\(=\frac{2}{10}=\frac{1}{5}\)
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 ?
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
683 x 35 = 23905
1654 x 425 = 702950
2438 x 306 = 746028
7/9 x 3/35 = 1/15 ( rút gọn )
15,7 ; 6,28 = 2,5
11/17 : 33/34 = 2/3 ( rút gọn )
36,66 : 7,8 = 4,7
15,7 : 6,28 = 2,5 ( lặp câu nè bạn )
27,63 : 0,45 = 61,4
683 x 35 = 23905
1654 x 425 = 702950
2438 x 306 = 746028
\(\frac{7}{9}\)x \(\frac{3}{35}\)= \(\frac{1}{15}\)
15,7 : 6,28 = 2,5
\(\frac{11}{17}\): \(\frac{33}{34}\)= \(\frac{2}{3}\)
36,66 : 7,8 = 4,7
15,7 : 6,28 = 2,5
27,63 : 0,45 = 61,4
a,8/3
b,1/5
c,17/135
d,2/3
e,5/2
a)\(\frac{8}{3}\)
b)\(\frac{1}{5}=0,2\)
c)\(\frac{17}{135}\)
d)\(\frac{2}{3}\)
e)\(\frac{5}{2}=2,5\)
a) 21/11 x 22/17 x 68/63
= (21 x 22 x 68)/ (11 x 17 x 63)
= 8/3
b) 5/14 x 7/13 x 26/25
= (5 x 7 x 26)/(14 x 13 x 25)
= (5 x 7 x 13 x 2) / ( 7 x 2 x 13 x 5 x 5)
= 1/5
c) 7/9 x 3/35 x 17/9
= (7 x 3 x 17)/ (9 x 35 x 9 )
= 17/135
d) 11/17 : 33/34
= 11/17 x 34/33
= (11 x 34)/(17 x 33)
= (11 x 17 x 2) / ( 17 x 33 x 11)
=2/33
e) 15,7 : 6,28
= 157/10 : 157/ 25
= 157/10 x 25/157
= (157 x 25) / ( 10 x 157)
= 25/10 = 5/2
k nha
a ) 8/3
b) 1/5
c) 17/135
d) 2/3
e) 5/2