\(\frac{6}{19}< \frac{ }{25}< \frac{7}{19}\)
Những câu hỏi liên quan
\(\frac{3}{11}\cdot\frac{7}{19}+\frac{17}{11}\cdot\frac{3}{19}-\frac{3}{19}\cdot\frac{25}{11}\)
Minh dang lam bai ban doi chut nhe, ti minh giai cho
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Tính nhanh!!\(\frac{17}{35}.37\frac{19}{25}+1\frac{8}{7}.33\frac{7}{25}+\left(\frac{17}{35}-1\frac{8}{17}\right).32\frac{6}{25}\)Các anh, chị giúp em ạ
tính giá trị:
A=\(\frac{5}{6}-\frac{-1}{12}+\frac{2}{3}-\frac{-2}{7}+\frac{1}{25}-\frac{-1}{4}-\frac{5}{42}\)
B=\(\frac{7.6^{10}.2^{20}.3^6-2^{19}.6^{15}}{9.6^{19}.2^9-4.3^{17}2^{26}}\)
\(\frac{-7}{25}+0,25.\frac{10}{19}+\frac{1}{4}.\frac{9}{19}+\frac{18}{25}\)
Tinh hop ly neu co the
\(-\frac{7}{25}+0,25.\frac{10}{19}+\frac{1}{4}.\frac{9}{19}+\frac{18}{25}\)
\(=\frac{-7+18}{25}+\frac{1}{4}.\frac{10}{19}+\frac{1}{4}.\frac{9}{19}\)
\(=\frac{11}{25}+\frac{19}{4.19}\)
\(=\frac{11}{25}+\frac{1}{4}\)
\(=\frac{69}{100}\)
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Tính bằng 2 cách:
\(\frac{17}{25}x\frac{13}{19}+\frac{17}{25}x\frac{6}{19}\)
C1) 17/25.13/19+17/25.6/19 C2) 17/25.13/19+17/25.6/19
=17/25.(13/19+6/19) =221/475+102/475
=17/25.1=17/25 =17/25
Học tốt nha
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\(C1:\)
\(\frac{17}{25}x\frac{13}{19}+\frac{17}{25}x\frac{6}{19}\)
\(=\frac{17}{25}x\left(\frac{13}{19}+\frac{6}{19}\right)\)
\(=\frac{17}{25}x1\)
\(=\frac{17}{25}\)
\(C2:\)
\(\frac{17}{25}x\frac{13}{19}+\frac{17}{25}x\frac{6}{19}\)
\(=\frac{221}{475}+\frac{102}{475}\)
\(=\frac{323}{475}=\frac{17}{25}\)
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tính bằng cách thuận tiện\(\frac{3}{7}x\frac{25}{19}-\frac{1}{7}x\frac{18}{19}\)
Uk, vậy cái dấu gì ở giữa chữ x và số 25/19 vậy bạn?? ^ ^
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Bài 4: THực hiện phép tính một cách hợp lý:
a) \(\frac{7}{19}.\frac{8}{11}+\frac{3}{11}.\frac{7}{19}+\frac{-12}{19}\) b) \(\frac{-7}{25}.\frac{39}{-14}.\frac{50}{78}\) c) \(\left(\frac{3}{8}+\frac{-3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
a ) \(\frac{7}{19}.\frac{8}{11}+\frac{3}{11}.\frac{7}{19}+\frac{-12}{19}\)
\(=\frac{7}{19}.\left(\frac{8}{11}+\frac{3}{11}\right)+\frac{-12}{19}\)
\(=\frac{7}{19}.\frac{11}{11}+\frac{-12}{19}\)
\(=\frac{7}{19}.1+\frac{-12}{19}\)
\(=\frac{7}{19}+\frac{-12}{19}\)
\(=\frac{7+\left(-12\right)}{19}\)
\(=-\frac{5}{19}\)
b ) \(\frac{-7}{25}.\frac{39}{-14}.\frac{50}{78}=\frac{-7.39.50}{25.-14.78}=\frac{-1.1.2}{1.-2.2}=\frac{-2}{-4}=\frac{1}{2}\)
c ) \(\left(\frac{3}{8}+\frac{-3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
\(=\frac{5}{24}:\frac{5}{6}+\frac{1}{2}\)
\(=\frac{5}{24}.\frac{6}{5}+\frac{1}{2}\)
\(=\frac{1}{4}+\frac{1}{2}\)
\(=\frac{3}{4}\)
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a)\(\frac{7}{19}.\frac{8}{11}+\frac{3}{11}.\frac{7}{19}+\frac{-12}{19}=\frac{7}{19}.\frac{8}{11}+\frac{3}{11}.\frac{7}{19}+\frac{7}{19}.\frac{-12}{7}=\frac{7}{19}.\left(\frac{8}{11}+\frac{3}{11}+-\frac{12}{7}\right)=\frac{7}{19}.\left(\frac{-5}{7}\right)=-\frac{5}{19}\)
b)\(\frac{-7}{25}.\frac{39}{-14}.\frac{50}{78}=\frac{\left(-7\right).39.50}{25.\left(-14\right).78}=\frac{\left(-7\right).3.13.2.5.5}{5.5.\left(-7\right).2.2.13.3}=\frac{1}{2}\)
c)\(\left(\frac{3}{8}+\frac{-3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}=\frac{5}{24}:\frac{5}{6}+\frac{1}{2}=\frac{2}{7}+\frac{1}{2}=\frac{11}{14}\)
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Tính nhanh:
\(\frac{\frac{-6}{7}+\frac{6}{19}-\frac{6}{31}}{\frac{9}{7}-\frac{9}{19}+\frac{9}{31}}\)
\(\frac{\frac{-6}{7}+\frac{6}{19}+\frac{-6}{31}}{\frac{9}{7}+\frac{-9}{19}+\frac{9}{31}}=\frac{-2\times\left(\frac{3}{7}+\frac{-3}{19}+\frac{3}{31}\right)}{3\times\left(\frac{3}{7}+\frac{-3}{19}+\frac{3}{31}\right)}\)
\(=\frac{-2}{3}\)
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Tính bằng cách thuận tiện
a) \(\frac{5}{11}x\frac{7}{25}+\frac{15}{11}x\frac{1}{5}\)
b) \(\frac{3}{7}x\frac{25}{19}-\frac{1}{7}x\frac{18}{19}\)
a, \(\frac{5}{11}\times\frac{7}{25}+\frac{15}{11}\times\frac{1}{5}\)
\(=\frac{5}{11}\times\frac{7}{25}+\frac{5}{11}\times\frac{3}{5}\)
\(=\frac{5}{11}\times\left(\frac{7}{25}+\frac{3}{5}\right)\)
\(=\frac{5}{11}\times\frac{22}{25}\)
\(=\frac{2}{5}\)
b, \(\frac{3}{7}\times\frac{25}{19}-\frac{1}{7}\times\frac{18}{19}\)
\(=\frac{1}{7}\times\frac{75}{19}-\frac{1}{7}\times\frac{18}{19}\)
\(=\frac{1}{7}\times\left(\frac{75}{19}-\frac{18}{19}\right)\)
\(=\frac{1}{7}\times3\)
\(=\frac{3}{7}\)