Câu hỏi của Phượng Phạm

Question

Nguyễn Lê Phước Thịnh · Accepted Answer

j: $\dfrac{7}{23}+\dfrac{-10}{18}+\dfrac{-4}{9}+\dfrac{16}{23}+\dfrac{-5}{8}$$=\left(\dfrac{7}{23}+\dfrac{16}{23}\right)+\left(-\dfrac{10}{18}-\dfrac{4}{9}\right)-\dfrac{5}{8}$$=1-1-\dfrac{5}{8}=-\dfrac{5}{8}$k: $\dfrac{1}{3}+\dfrac{-3}{4}+\dfrac{3}{5}+\dfrac{-1}{36}+\dfrac{1}{15}+\dfrac{-2}{9}$$=\left(\dfrac{1}{3}+\dfrac{3}{5}+\dfrac{1}{15}\right)+\left(-\dfrac{3}{4}-\dfrac{1}{36}-\dfrac{2}{9}\right)$$=\dfrac{5+9+1}{15}+\dfrac{-27-1-8}{36}$$=\dfrac{15}{15}-\dfrac{36}{36}=1-1=0$l: $-\dfrac{2}{15}+\dfrac{12}{13}+\dfrac{-13}{15}+\dfrac{-1}{13}$$=\left(-\dfrac{2}{15}-\dfrac{13}{15}\right)+\left(\dfrac{12}{13}+\dfrac{-1}{13}\right)$$=\dfrac{-15}{15}+\dfrac{11}{13}=-1+\dfrac{11}{13}=-\dfrac{2}{13}$m: $-\dfrac{5}{7}+\dfrac{3}{4}+\dfrac{-1}{5}+\dfrac{-2}{7}+\dfrac{1}{4}$$=\left(-\dfrac{5}{7}-\dfrac{2}{7}\right)+\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\dfrac{-1}{5}$$=\dfrac{-7}{7}+\dfrac{4}{4}+\dfrac{-1}{5}=-1+1+\dfrac{-1}{5}=-\dfrac{1}{5}$n: $\dfrac{4}{7}+\dfrac{-1}{9}+\dfrac{3}{7}+\dfrac{7}{10}+\dfrac{-8}{9}$$=\left(\dfrac{4}{7}+\dfrac{3}{7}\right)+\left(-\dfrac{1}{9}-\dfrac{8}{9}\right)+\dfrac{7}{10}$$=\dfrac{7}{7}-\dfrac{9}{9}+\dfrac{7}{10}=1-1+\dfrac{7}{10}=\dfrac{7}{10}$o: $\dfrac{4}{7}+\dfrac{3}{4}+\dfrac{2}{7}+\dfrac{5}{4}+\dfrac{1}{7}$$=\left(\dfrac{4}{7}+\dfrac{2}{7}+\dfrac{1}{7}\right)+\left(\dfrac{3}{4}+\dfrac{5}{4}\right)$$=\dfrac{7}{7}+\dfrac{8}{4}$=1+2=3p: $\dfrac{5}{2}+\dfrac{6}{11}+\dfrac{3}{8}+\dfrac{7}{2}+\dfrac{6}{8}+\dfrac{5}{11}$$=\left(\dfrac{5}{2}+\dfrac{7}{2}\right)+\left(\dfrac{6}{11}+\dfrac{5}{11}\right)+\left(\dfrac{3}{8}+\dfrac{6}{8}\right)$$=\dfrac{12}{2}+\dfrac{11}{11}+\dfrac{9}{8}$$=6+1+\dfrac{9}{8}=7+\dfrac{9}{8}=\dfrac{65}{8}$q: $\dfrac{4}{3}+\dfrac{3}{5}+\dfrac{7}{3}+\dfrac{2}{5}+\dfrac{1}{3}$$=\left(\dfrac{4}{3}+\dfrac{7}{3}+\dfrac{1}{3}\right)+\left(\dfrac{3}{5}+\dfrac{2}{5}\right)$$=\dfrac{12}{3}+\dfrac{5}{5}=4+1=5$r: $\dfrac{5}{17}+\dfrac{-9}{15}+\dfrac{-2}{17}+\dfrac{2}{-5}$$=\left(\dfrac{5}{17}-\dfrac{2}{17}\right)+\left(-\dfrac{3}{5}-\dfrac{2}{5}\right)$$=\dfrac{3}{17}-1=-\dfrac{14}{17}$Câu trả lời: j: $\dfrac{7}{23}+\dfrac{-10}{18}+\dfrac{-4}{9}+\dfrac{16}{23}+\dfrac{-5}{8}$$=\left(\dfrac{7}{23}+\dfrac{16}{23}\right)+\left(-\dfrac{10}{18}-\dfrac{4}{9}\right)-\dfrac{5}{8}$$=1-1-\dfrac{5}{8}=-\dfrac{5}{8}$k: $\dfrac{1}{3}+\dfrac{-3}{4}+\dfrac{3}{5}+\dfrac{-1}{36}+\dfrac{1}{15}+\dfrac{-2}{9}$$=\left(\dfrac{1}{3}+\dfrac{3}{5}+\dfrac{1}{15}\right)+\left(-\dfrac{3}{4}-\dfrac{1}{36}-\dfrac{2}{9}\right)$$=\dfrac{5+9+1}{15}+\dfrac{-27-1-8}{36}$$=\dfrac{15}{15}-\dfrac{36}{36}=1-1=0$l: $-\dfrac{2}{15}+\dfrac{12}{13}+\dfrac{-13}{15}+\dfrac{-1}{13}$$=\left(-\dfrac{2}{15}-\dfrac{13}{15}\right)+\left(\dfrac{12}{13}+\dfrac{-1}{13}\right)$$=\dfrac{-15}{15}+\dfrac{11}{13}=-1+\dfrac{11}{13}=-\dfrac{2}{13}$m: $-\dfrac{5}{7}+\dfrac{3}{4}+\dfrac{-1}{5}+\dfrac{-2}{7}+\dfrac{1}{4}$$=\left(-\dfrac{5}{7}-\dfrac{2}{7}\right)+\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\dfrac{-1}{5}$$=\dfrac{-7}{7}+\dfrac{4}{4}+\dfrac{-1}{5}=-1+1+\dfrac{-1}{5}=-\dfrac{1}{5}$n: $\dfrac{4}{7}+\dfrac{-1}{9}+\dfrac{3}{7}+\dfrac{7}{10}+\dfrac{-8}{9}$$=\left(\dfrac{4}{7}+\dfrac{3}{7}\right)+\left(-\dfrac{1}{9}-\dfrac{8}{9}\right)+\dfrac{7}{10}$$=\dfrac{7}{7}-\dfrac{9}{9}+\dfrac{7}{10}=1-1+\dfrac{7}{10}=\dfrac{7}{10}$o: $\dfrac{4}{7}+\dfrac{3}{4}+\dfrac{2}{7}+\dfrac{5}{4}+\dfrac{1}{7}$$=\left(\dfrac{4}{7}+\dfrac{2}{7}+\dfrac{1}{7}\right)+\left(\dfrac{3}{4}+\dfrac{5}{4}\right)$$=\dfrac{7}{7}+\dfrac{8}{4}$=1+2=3p: $\dfrac{5}{2}+\dfrac{6}{11}+\dfrac{3}{8}+\dfrac{7}{2}+\dfrac{6}{8}+\dfrac{5}{11}$$=\left(\dfrac{5}{2}+\dfrac{7}{2}\right)+\left(\dfrac{6}{11}+\dfrac{5}{11}\right)+\left(\dfrac{3}{8}+\dfrac{6}{8}\right)$$=\dfrac{12}{2}+\dfrac{11}{11}+\dfrac{9}{8}$$=6+1+\dfrac{9}{8}=7+\dfrac{9}{8}=\dfrac{65}{8}$q: $\dfrac{4}{3}+\dfrac{3}{5}+\dfrac{7}{3}+\dfrac{2}{5}+\dfrac{1}{3}$$=\left(\dfrac{4}{3}+\dfrac{7}{3}+\dfrac{1}{3}\right)+\left(\dfrac{3}{5}+\dfrac{2}{5}\right)$$=\dfrac{12}{3}+\dfrac{5}{5}=4+1=5$r: $\dfrac{5}{17}+\dfrac{-9}{15}+\dfrac{-2}{17}+\dfrac{2}{-5}$$=\left(\dfrac{5}{17}-\dfrac{2}{17}\right)+\left(-\dfrac{3}{5}-\dfrac{2}{5}\right)$$=\dfrac{3}{17}-1=-\dfrac{14}{17}$

Duy Nguyễn Văn Duy · Answer

j: 723+−1018+−49+1623+−58723+−1018+−49+1623+−58=(723+1623)+(−1018−49)−58=(723+1623)+(−1018−49)−58=1−1−58=−58=1−1−58=−58k: 13+−34+35+−136+115+−2913+−34+35+−136+115+−29=(13+35+115)+(−34−136−29)=(13+35+115)+(−34−136−29)=5+9+115+−27−1−836=5+9+115+−27−1−836=1515−3636=1−1=0=1515−3636=1−1=0l: −215+1213+−1315+−113−215+1213+−1315+−113=(−215−1315)+(1213+−113)=(−215−1315)+(1213+−113)=−1515+1113=−1+1113=−213=−1515+1113=−1+1113=−213m: −57+34+−15+−27+14−57+34+−15+−27+14=(−57−27)+(34+14)+−15=(−57−27)+(34+14)+−15=−77+44+−15=−1+1+−15=−15=−77+44+−15=−1+1+−15=−15n: 47+−19+37+710+−8947+−19+37+710+−89=(47+37)+(−19−89)+710=(47+37)+(−19−89)+710=77−99+710=1−1+710=710=77−99+710=1−1+710=710o: 47+34+27+54+1747+34+27+54+17=(47+27+17)+(34+54)=(47+27+17)+(34+54)=77+84=77+84=1+2=3p: 52+611+38+72+68+51152+611+38+72+68+511=(52+72)+(611+511)+(38+68)=(52+72)+(611+511)+(38+68)=122+1111+98=122+1111+98=6+1+98=7+98=658=6+1+98=7+98=658q: 43+35+73+25+1343+35+73+25+13=(43+73+13)+(35+25)=(43+73+13)+(35+25)=123+55=4+1=5=123+55=4+1=5r: 517+−915+−217+2−5517+−915+−217+2−5=(517−217)+(−35−25)=(517−217)+(−35−25)=317−1=−1417Câu trả lời: j: 723+−1018+−49+1623+−58723+−1018+−49+1623+−58=(723+1623)+(−1018−49)−58=(723+1623)+(−1018−49)−58=1−1−58=−58=1−1−58=−58k: 13+−34+35+−136+115+−2913+−34+35+−136+115+−29=(13+35+115)+(−34−136−29)=(13+35+115)+(−34−136−29)=5+9+115+−27−1−836=5+9+115+−27−1−836=1515−3636=1−1=0=1515−3636=1−1=0l: −215+1213+−1315+−113−215+1213+−1315+−113=(−215−1315)+(1213+−113)=(−215−1315)+(1213+−113)=−1515+1113=−1+1113=−213=−1515+1113=−1+1113=−213m: −57+34+−15+−27+14−57+34+−15+−27+14=(−57−27)+(34+14)+−15=(−57−27)+(34+14)+−15=−77+44+−15=−1+1+−15=−15=−77+44+−15=−1+1+−15=−15n: 47+−19+37+710+−8947+−19+37+710+−89=(47+37)+(−19−89)+710=(47+37)+(−19−89)+710=77−99+710=1−1+710=710=77−99+710=1−1+710=710o: 47+34+27+54+1747+34+27+54+17=(47+27+17)+(34+54)=(47+27+17)+(34+54)=77+84=77+84=1+2=3p: 52+611+38+72+68+51152+611+38+72+68+511=(52+72)+(611+511)+(38+68)=(52+72)+(611+511)+(38+68)=122+1111+98=122+1111+98=6+1+98=7+98=658=6+1+98=7+98=658q: 43+35+73+25+1343+35+73+25+13=(43+73+13)+(35+25)=(43+73+13)+(35+25)=123+55=4+1=5=123+55=4+1=5r: 517+−915+−217+2−5517+−915+−217+2−5=(517−217)+(−35−25)=(517−217)+(−35−25)=317−1=−1417

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