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a ) \(-\frac{13}{30}+\frac{11}{20}-\frac{7}{15}\)
\(=-\frac{26}{60}+\frac{33}{60}-\frac{28}{60}\)
\(=\frac{-26+33-28}{60}=-\frac{7}{20}\)
b ) \(-\frac{5}{72}:\left(\frac{3}{8}.\frac{7}{9}\right)\)
\(=-\frac{5}{72}:\frac{3.7}{8.9}\)
\(=-\frac{5}{72}:\frac{7}{24}\)
\(=-\frac{5}{72}.\frac{24}{7}=-\frac{5}{21}\)
a) \(\frac{-13}{30}+\frac{11}{20}-\frac{7}{15}=\frac{-26}{60}+\frac{33}{60}-\frac{28}{60}=-\frac{21}{60}=-\frac{7}{20}\)
b) \(\frac{-5}{72}:\left(\frac{3}{8}.\frac{7}{9}\right)=\frac{-5}{72}:\frac{7}{24}=-\frac{5}{21}\)
c) \(\frac{-23}{25}.\frac{10}{13}+\frac{-23}{25}.\frac{3}{13}+\frac{-27}{25}\)
\(=\frac{-23}{25}.\left(\frac{10}{13}+\frac{3}{13}\right)+\frac{-27}{25}\)
\(=\frac{-23}{25}+\frac{-27}{25}\)
\(=\frac{-50}{25}=-2\)
1: Ta có: \(2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-174-2155-68+174\)
=-68
2) Ta có: \(-25\cdot72+25\cdot21-49\cdot25\)
\(=-25\cdot\left(72-21+49\right)\)
\(=-25\cdot100=-2500\)
1) 2155-(174+2155)+(-68+174-7)-1911-(1234-1911)
=2155-174-2155+(-68)+174-7-1911-1234+1911
=(2155-2155)+(174-174)+(1911-1911)-(68+7+1234)
= 0 + 0 + 0 - 1309
= -1309
1) 2155 - (174 + 2155) + (-68 + 174)
= 2155 - 174 - 2155 - 68 + 174
= (2155 - 2155) + (-174 + 174) - 68
= 0 + 0 - 68
= -68
2) -25 . 72 + 25 . 21 - 49 . 25
= 25 . (-72) + 25 . 21 - 49 . 25
= 25 . (-72 + 21 - 25)
= 25 . (-76)
= -1900
3) 35 . (14 - 23) - 23 . (14 - 35)
= 35 . 14 - 35 . 23 - 23 . 14 + 23 . 35
= (35 . 14 - 23 . 14) + (-35 . 23 + 23 . 35)
= [14 . (35 - 23)] + 0
= 14 . 12
= 168
4) 8154 - (674 + 8154) + (-98 + 674)
= 8154 - 674 - 8154 - 98 + 674
= (8154 - 8154) + (-674 + 674) - 98
= 0 + 0 - 98
= -98
5) -25 . 21 + 25 . 72 + 49 . 25
= 25 . (-21) + 25 . 72 + 49 . 25
= 25 . (-21 + 72 + 49)
= 25 . 100
= 2500
6) 27 . (13 - 16) - 16 . (13 - 17)
= 27 . 13 - 27 . 16 - 16 . 13 + 16 . 17
= (27 . 13 - 16 . 13) + (-27 . 16 + 16 . 17)
= [13 . (27 - 16)] + [16 . (-27 + 17)]
= (13 . 11) + [16 . (-10)]
= 143 - 160
= -17
1) 2155-2155-(174-174)+-68=0+0+-68=-68
giờ mk ghi kq được ko
-23/25.10/13+-23/25.3/13+-27/25
= -23/25(10/13+3/13)+-27/25
= -23/25.1+-27/25
= -23/25+-27/25
= -2
-23/25.10/13+-23/25.3/13+27/25
= -23/25.(10/13+3/10)+ -27/25
=23/25.1+-27/25
=23/25+ -27/25
=-2