hay tinh phep tinh sau hop ly:
(13-135+49)-(13+49)
26.(24-11)-24.(26-11)
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Đặt \(A=\frac{9+\frac{9}{11}+\frac{18}{23}-\frac{27}{37}}{8+\frac{8}{11}+\frac{16}{23}-\frac{24}{37}}-\frac{2+\frac{16}{29}-\frac{24}{13}-\frac{32}{11}}{3+\frac{24}{29}-\frac{36}{13}-\frac{48}{11}}\)\(=\frac{9\left(1+\frac{1}{11}+\frac{2}{23}-\frac{3}{37}\right)}{8\left(1+\frac{1}{11}+\frac{2}{23}-\frac{3}{37}\right)}-\frac{2\left(1+\frac{8}{29}-\frac{12}{13}-\frac{16}{11}\right)}{3\left(1+\frac{8}{29}-\frac{12}{13}-\frac{16}{11}\right)}\)
\(=\frac{9}{8}-\frac{2}{3}\)(do \(1+\frac{1}{11}+\frac{2}{23}-\frac{3}{37};1+\frac{8}{29}-\frac{12}{13}-\frac{16}{11}\ne0\))
\(=\frac{27}{24}-\frac{16}{24}=\frac{11}{24}.\)
Vậy A = \(\frac{11}{24}.\)
(13-135+49)-(13+49)
= 13-135+49-13-49
= 13-13+49-49-135
= 0+0-135
= -135
\(\dfrac{24}{13}:\dfrac{12}{26}+\dfrac{49}{15}:\dfrac{7}{30}\)
\(=\dfrac{24}{13}\times\dfrac{26}{12}+\dfrac{49}{15}\times\dfrac{30}{7}\)
\(=4+14\)
\(=18\)
a) Ta thấy: 7/9<1, 11/13<1, 24/25<1 nên 7/9+11/13+24/25<3
b) Ta thấy: 9/8>1, 13/12>1, 15/13>1, 5/4>1 nên 9/8+13/12+15/13+5/4>4
(13-135+49)-(13+49)
= 13-135 + 49 - 13-49
= ( 13-13) + ( 49-49) -135
= 0 -135
=-135
26.(24-11)-24.(26-11)
= 26.24 - 11.26 - 24.26 - 11.24
= 24.(26-26) -11(26-24)
= 0 - 11.2
=-22
\(\left(13-135+49\right)-\left(13+49\right)\))
\(=13-135+49-13-49\)
\(=\left(13-13\right)+\left(49-49\right)-135\)
\(=0-135=-135\)
\(26.\left(24-11\right)-24.\left(26-11\right)\)
\(=26.24-11.26-24.26-11.24\)
\(=24.\left(26-26\right)-11.\left(26-24\right)\)
\(=0-11.2=-22\)