Biểu thức trên có kết quả là:24/7

146/13 - 710/91

303/91

\(\frac{146}{13}-\left(\frac{18}{7}+\frac{68}{13}\right)\)

\(=\frac{146}{13}-\frac{18}{7}-\frac{68}{13}\)

\(=\left(\frac{146}{13}-\frac{68}{13}\right)-\frac{18}{7}\)

\(=6-\frac{18}{7}\)

\(=\frac{24}{7}\)

-3/11.(-22)/66.121/15

=(-3).(-22).121

 11.66.15

=11

15

3/7.2/5.7/3.20.19/72

=3.2.7.20.19

7.5.3.72

=76

16

6/7.8/13+6/13.9/7-3/13.6/7

=6/7.8/13+6/7.9/13-3/13.6/7

=6/7.(8/13+9/13-3/13)

=6/7.14/13

=12/13

-1/4.152/11+68/4.(-1)/11

=152/4.(-1)/11+68/4.(-1)/11

=(-1)/11.(152/4+68/4)

=(-1)/11.220/4

=-110/22

-5/7.2/11+(-5)/7.9/11+12/7

=-5/7.2/11+-5/7.9/11+12/7

=-5/7.(2/11+9/11)+12/7

=-5/7.1+12/7

=(-5)/7+12/7

=7/7

=1

146/13-(18/7+68/13)

=146/13-18/7-68/13

=(146/13-68/13)-18/7

=78/13-18/7

=6-18/7

=42/7-18/7

=24/7

a) \(\frac{58}{19}+\frac{13}{17}+\frac{35}{43}+\frac{119}{19}+\frac{8}{43}\)

\(=\frac{13}{17}+\left(\frac{58}{19}+\frac{119}{19}\right)+\left(\frac{35}{43}+\frac{8}{43}\right)\)

\(=\frac{13}{17}+\frac{204}{19}+1\)

\(=\frac{1808}{133}\)

b) \(\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{11}+\frac{13}{4}\)

\(=\frac{-5}{7}.\left(\frac{2}{11}+\frac{9}{11}\right)+\frac{13}{4}\)

\(=\frac{-5}{7}.1+\frac{13}{4}\)

\(=\frac{71}{28}\)

c) \(\frac{146}{13}-\left(\frac{21}{7}+\frac{68}{13}\right)\)

\(=\left(\frac{164}{13}-\frac{68}{13}\right)+3\)

\(=\frac{135}{13}\)

d) \(\frac{2}{7}.\frac{21}{4}-\frac{2}{7}.\frac{13}{4}\)

\(=\frac{2}{7}.\left(\frac{21}{4}-\frac{13}{4}\right)\)

\(=\frac{2}{7}.\frac{8}{4}\)

\(=\frac{4}{7}\)

P/s: Mk ko chắc nữa!

b: \(=\dfrac{-5}{7}\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+\dfrac{13}{4}=\dfrac{-5}{7}+\dfrac{13}{4}=\dfrac{-20+91}{28}=\dfrac{71}{28}\)

c: \(=\dfrac{146}{13}-3-\dfrac{68}{13}=6-3=3\)

d: \(=\dfrac{2}{7}\left(\dfrac{21}{4}-\dfrac{13}{4}\right)=\dfrac{4}{7}\)

(26-6).(-4)+31.(-7-13)

=20.27.(-20)

=540.(-20)

=-10800

a, \(\frac{11}{120}=\frac{11.40}{120.40}=\frac{440}{4800}\)

\(\frac{7}{40}=\frac{7.120}{40.120}=\frac{840}{4800}\)

b,\(\frac{24}{146}=\frac{24.13}{146.13}=\frac{312}{1898}\)

\(\frac{6}{13}=\frac{6.146}{13.146}=\frac{876}{1898}\)

c,\(\frac{7}{30}=\frac{7.60.40}{30.60.40}=\frac{16800}{72000}\)

\(\frac{13}{60}=\frac{13.30.40}{60.30.40}=\frac{15600}{72000}\)

\(\frac{-9}{40}=\frac{-9.60.30}{40.60.30}=\frac{-16200}{72000}\)

d,\(\frac{17}{60}=\frac{17.18.90}{60.18.90}=\frac{27540}{97200}\)

\(\frac{-5}{18}=\frac{-5.60.90}{18.60.90}=\frac{-27000}{97200}\)

\(\frac{-64}{90}=\frac{-64.18.60}{90.18.60}=\frac{-69120}{97200}\)

740 =7.12040.120 =8404800 

b,24146 =24.13146.13 =3121898 

1360 =13.30.4060.30.40 =1560072000 

−940 =−9.60.3040.60.30 =−1620072000 

d,1760 =17.18.9060.18.90 =2754097200 

−518 =−5.60.9018.60.90 =−2700097200 

−6490 =−64.18.6090.18.60 =−6912097200 

613 =6.14613.146 =8761898 

c,