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\(\frac{-315}{540}\) =\(\frac{-7}{12}\)
\(\frac{25.13}{26.35}\) = \(\frac{5}{14}\)
\(\frac{6.9-2.17}{63.3-119}\) =\(\frac{2}{7}\)
a) \(\frac{-315}{540}=\frac{-315:45}{540:45}=\frac{-7}{12}\)
b) \(\frac{25\cdot13}{26\cdot35}=\frac{5\cdot5\cdot13}{13\cdot2\cdot7\cdot5}=\frac{5}{14}\)
c) \(\frac{6\cdot9-2\cdot17}{63\cdot3-119}=\frac{3\cdot2\cdot9-2\cdot17}{9\cdot7\cdot3-7\cdot17}=\frac{2}{7}\)
chắc là đúng bn ạ. CHÚC BN HOK TỐT...^_^
Việt Nam đất nước anh hùng.....^^
Trung Quốc là nước nửa khùng nửa điên.
Việt Nam đang sống bình yên.
Trung Quốc đừng có làm phiền Việt Nam.
Trung Quốc đông dân toàn cỏ rác.
Việt Nam lác đác toàn siêu nhân.
Việt Nam cưỡi rồng bay trong gió.
Trung Quốc cưỡi chó sủa:"gâu" "gâu".
Thái Lan hỏi nó đi đâu.
Nó cười, nó bảo:" đi hầu Việt Nam
a)\(\frac{-315}{540}\)=\(\frac{7}{12}\)
b)\(\frac{25.13}{26.35}\)=\(\frac{5}{14}\)
c)\(\frac{6.9-2.17}{63.3-119}\)=\(\frac{4}{7}\)
d)\(\frac{2929-101}{2.1919+404}\)=\(\frac{2}{3}\)
\(\frac{3.4+3.7}{6.5+9}\)và \(\frac{6.9-2.17}{63.3-119}\)
\(\frac{3.4+3.7}{6.5+9}=\frac{3\left(4+7\right)}{30+9}=\frac{3.11}{39}=\frac{33}{39}=\frac{11}{13}\)
\(\frac{6.9-2.17}{63.3-119}=\frac{54-54}{63.3-11}=0\)
ta có:
\(\frac{3.4+3.7}{6.5+9}=\frac{3.\left(4+7\right)}{3.\left(2.5\right)+3.3}=\frac{3.\left(4+7\right)}{3.\left(2.5+3\right)}\)
\(=\frac{3.\left(4+7\right)}{3.\left(10+3\right)}=\frac{3.11}{3.13}=\frac{3}{3}.\frac{11}{13}=1.\frac{11}{13}=\frac{11}{13}\)
và \(\frac{6.9-2.17}{63.3-119}=\frac{2.\left(3.9\right)-2.17}{7.\left(9.3\right)-7.17}=\frac{2.\left(3.9-17\right)}{7.\left(9.3-17\right)}\)
\(=\frac{2}{7}.\frac{\left(3.9\right)-17}{\left(9.3\right)-17}=\frac{2}{7}.1=\frac{2}{7}\)
Vậy ta sẽ quy đồng mẫu số hai phân số: \(\frac{11}{13}\)và \(\frac{2}{7}\)(MSC: 91)
Ta có: \(\frac{11}{13}=\frac{11.7}{13.7}=\frac{77}{91}\)
và \(\frac{2}{7}=\frac{2.13}{7.13}=\frac{26}{91}\)
Ta còn quy đồng được tử số của hai phân số \(\frac{11}{13}\)và \(\frac{2}{7}\)(tử chung: 22)
ta có: \(\frac{11}{13}=\frac{11.2}{13.2}=\frac{22}{26}\)
và \(\frac{2}{7}=\frac{2.11}{7.11}=\frac{22}{77}\)
Câu a:
\(\frac{3939-101}{3.2929+505}\)
= \(\frac{101.\left(39-1\right)}{101.\left(3.29+5\right)}\)
= \(\frac{38}{87+5}\)
= \(\frac{38}{92}\)
= \(\frac{19}{46}\)
Câu c:
\(\frac{6.9-2.17}{63.3-119}\)
= \(\frac{2.\left(3.9-17\right)}{7.\left(9.3-17\right)}\)
= \(\frac27\)
Trả lời:
a, \(\frac{6\times9-2\times17}{63\times3-119}=\frac{2.3\times9-2\times17}{7.9\times3-7.17}\)
\(=\frac{2\times\left(3\times9-17\right)}{7\times\left(3\times9-17\right)}\)
\(=\frac{2}{7}\)
b, \(\frac{3\times13-13\times18}{15\times40-80}=\frac{13\times\left(3-18\right)}{40\times\left(15-2\right)}\)
\(=\frac{13\times-15}{40\times13}\)
\(=\frac{-3}{8}\)
c, \(\frac{-1997.1996+1}{\left(-1995\right).\left(-1997\right)+1996}=\frac{-1997.1996+1}{\left(1-1996\right).\left(-1997\right)+1996}\)
\(=\frac{-1997.1996+1}{-1997-1996.\left(-1997\right)+1996}\)
\(=\frac{-1997.1996+1}{-1996.\left(-1997\right)-1}\)
\(=\frac{-1997.1996+1}{-\left[1996.\left(-1997\right)+1\right]}\)
\(=-1\)
d, \(\frac{3.7.13.37.39-10101}{505050-70707}=\frac{10101.39-10101}{50.10101-7.10101}\)
\(=\frac{10101.\left(39-1\right)}{10101.\left(50-7\right)}\)
\(=\frac{10101.38}{10101.43}\)
\(=\frac{38}{43}\)
\(\frac{3.4+3.7}{6.5+9}\)
\(=\frac{3.\left(4+7\right)}{30+9}\)
\(=\frac{11}{13}\)
\(\frac{6.9-2.17}{63.3-119}\)
\(=\frac{54-34}{189-119}\)
\(=\frac{2}{7}\)
A = \(\frac{3.4+3.7}{6.5+9}\)
A = \(\frac{3.\left(4+7\right)}{3.\left(10+3\right)}\)
A = \(\frac{11}{13}\)
B = \(\frac{6.9-2.17}{63.3-119}\)
B = \(\frac{2.\left(27-17\right)}{7.\left(27-17\right)}\)
B = \(\frac27\)
A = \(\frac{11}{13}\) = \(\frac{77}{91}\)
B = \(\frac27=\frac{26}{91}\)
a ) \(\frac{3^2.5^2+15.7}{22.6+18.11}\)
= \(\frac{15.15+15.7}{33.4+6.33}\)
= \(\frac{15.\left(15+7\right)}{33.\left(4+6\right)}\)
= \(\frac{15.22}{33.10}\)
= \(\frac{3.5.11.2}{11.3.5.2}\)
= 1
a,\(\frac{3^2.5^2+15.7}{22.6+18.11}=\frac{9.15+15.7}{11.12+18.11}=\frac{\left(9+7\right).15}{11\left(12+18\right)}\)\(=\frac{16.15}{11.30}=\frac{8}{11}\)
b,\(\frac{6.9-2.17}{63.3-119}=\frac{2.27-2.17}{7.27-7.17}=\frac{2.\left(27-17\right)}{7.\left(27-17\right)}\)\(=\frac{2}{7}\)
c,\(\frac{3^{10}.11+3^{10}.5}{3^9.2^4}=\frac{3^{10}.\left(11+5\right)}{3^9.16}=\frac{3.16}{16}=3\)
a) \(\frac{3^2.5^2+15.7}{22.6+18.11}\)
\(=\frac{3.3.5.5+15.7}{22.6+6.3.11}\)
\(=\frac{15.15+15.7}{22.6+6.33}\)
\(=\frac{15.\left(15+7\right)}{6.\left(22+33\right)}\)
\(=\frac{15.22}{6.55}\)
\(=\frac{5.3.22}{6.5.11}\)
\(=\frac{3.22}{6.11}\)
\(=\frac{66}{66}=1\)
b) \(\frac{6.9-2.17}{63.3-119}\)
\(=\frac{2.27-2.17}{7.27-17.7}\)
\(=\frac{2.\left(27-17\right)}{7.\left(27-17\right)}\)
\(=\frac{2.10}{7.10}=\frac{2}{7}\)
c)\(\frac{3^{10}.11+3^{10}.5}{3^9.2^4}\)
\(=\frac{3^{10}.\left(11+5\right)}{3^9.2^4}\)
\(=\frac{3^{10}.16}{3^9.2^4}\)
\(=\frac{3^{10}.2^4}{3^9.2^4}\)
\(=\frac{3^{10}}{3^9}=3^{10-9}=3\)
\(a,\frac{3^2.5^2+15.7}{22.6+18.11}=\frac{15.15+15.7}{11.12+18.11}=\frac{15\left(15+7\right)}{11\left(12+18\right)}=\frac{15.22}{11.20}=\frac{3}{2}\)
\(b,\frac{6.9-2.17}{63.3-119}=\frac{2\left(3.9-17\right)}{7.27-7.17}=\frac{2.10}{7.10}=\frac{2}{7}\)
\(c,\frac{3^{10}.11+3^{10}.5}{3^9.2^4}=\frac{3^{10}\left(11+5\right)}{3^9.16}=\frac{3^{10}.16}{3^9.16}=3\)