\(=\dfrac{\left(-14\right).\left(-25\right)}{\left(-15\right).7}=\dfrac{350}{-105}=\dfrac{350:35}{-105:35}=\dfrac{10}{-3}=-\dfrac{10}{3}\)
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bài 1:tínha)left(dfrac{-7}{15}-dfrac{27}{70}right)-left(dfrac{8}{15}+dfrac{43}{70}right)b)dfrac{3}{7}+left(dfrac{-1}{5}+dfrac{-3}{7}right)c)left(4-dfrac{12}{5}right).dfrac{25}{8}-dfrac{2}{5}:dfrac{-4}{25}d)left(dfrac{-5}{24}+dfrac{3}{4}-dfrac{7}{12}right):left(-dfrac{5}{16}right)e)dfrac{-5}{7}.dfrac{2}{11}+dfrac{-5}{7}.dfrac{9}{11}g)dfrac{6}{7}+dfrac{5}{4}:left(-5right)-dfrac{-1}{28}.left(-2right)^2
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bài 1:tính
a)\(\left(\dfrac{-7}{15}-\dfrac{27}{70}\right)-\left(\dfrac{8}{15}+\dfrac{43}{70}\right)\)
b)\(\dfrac{3}{7}+\left(\dfrac{-1}{5}+\dfrac{-3}{7}\right)\)
c)\(\left(4-\dfrac{12}{5}\right).\dfrac{25}{8}-\dfrac{2}{5}:\dfrac{-4}{25}\)
d)\(\left(\dfrac{-5}{24}+\dfrac{3}{4}-\dfrac{7}{12}\right):\left(-\dfrac{5}{16}\right)\)
e)\(\dfrac{-5}{7}.\dfrac{2}{11}+\dfrac{-5}{7}.\dfrac{9}{11}\)
g)\(\dfrac{6}{7}+\dfrac{5}{4}:\left(-5\right)-\dfrac{-1}{28}.\left(-2\right)^2\)
tính
a)\(\dfrac{-10}{11}.\dfrac{8}{9}+\dfrac{7}{18}.\dfrac{10}{11}\)
b)\(\dfrac{3}{14}:\dfrac{1}{28}-\dfrac{13}{21}:\dfrac{1}{28}+\dfrac{29}{42}:\dfrac{1}{28}-8\)
c)\(-1\dfrac{5}{7}.15+\dfrac{2}{7}\left(-15\right)+\left(-105\right).\left(\dfrac{2}{3}-\dfrac{4}{5}+\dfrac{1}{7}\right)\)
Tìm x:
d) \(\dfrac{-5}{6}-x=\dfrac{7}{12}+\dfrac{-1}{3}\)
e) \(\dfrac{x+3}{-15}=\dfrac{1}{3}\)
f) \(\left(4,5-2x\right).\left(-1\dfrac{4}{7}\right)=\dfrac{11}{14}\)
24 tháng 1 2022 lúc 15:29
\(P=\dfrac{2.5^{22}-9.5^{20}}{25^{10}}:\dfrac{5\left(3.7^{15}-19.7^{14}\right)}{7^{16}+3.7^{15}}\)
\(\dfrac{\left(13\dfrac{1}{4}-2\dfrac{5}{27}-10\dfrac{5}{6}\right)\cdot230\dfrac{1}{25}+46\dfrac{3}{4}}{\left(1\dfrac{3}{7}+\dfrac{10}{3}\right):\left(12\dfrac{1}{3}-14\dfrac{2}{7}\right)}\) tính giúp mình với
\(\left(\dfrac{-3}{5}\right)^{15}:\left(\dfrac{-9}{25}\right)^7\)
20 tháng 8 2023 lúc 15:55
Rút gọn các phân số sau:(cho mik xin cách giải ak)a) dfrac{left(-14right).15}{21.left(-10right)}b)dfrac{5.7-7.9}{7.2+6.7}c)dfrac{left(-7right).3+2.left(-14right)}{left(-5right).7-2.7}d)dfrac{3^9.3^{20}.2^8}{3^{24}.243.2^6}e)dfrac{2^{15}.5^3.2^6.3^4}{8.2^{18}.81.5}f)dfrac{24.315+3.561.8+4.124.6}{1+3+5+...+97+99-500}
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Rút gọn các phân số sau:(cho mik xin cách giải ak)
a) \(\dfrac{\left(-14\right).15}{21.\left(-10\right)}\)
b)\(\dfrac{5.7-7.9}{7.2+6.7}\)
c)\(\dfrac{\left(-7\right).3+2.\left(-14\right)}{\left(-5\right).7-2.7}\)
d)\(\dfrac{3^9.3^{20}.2^8}{3^{24}.243.2^6}\)
e)\(\dfrac{2^{15}.5^3.2^6.3^4}{8.2^{18}.81.5}\)
f)\(\dfrac{24.315+3.561.8+4.124.6}{1+3+5+...+97+99-500}\)
1 tháng 3 2022 lúc 14:17
\(\dfrac{-2}{7}-\dfrac{1}{4}\)
\(\dfrac{-1}{2}.\dfrac{4}{9}+\dfrac{3}{7}\div\dfrac{15}{14}\)
\(\left(\dfrac{-3}{4}+\dfrac{7}{10}\right)\div\left(\dfrac{-1}{5}\right)-\dfrac{2}{9}\)
Tìm x biết:
a, \(\dfrac{3}{5}:x+\dfrac{1}{5}=\dfrac{11}{25}\)
b, \(2\left(x-\dfrac{1}{3}\right)-1\dfrac{2}{3}=\dfrac{-23}{15}\)
c, \(\left|x+1\right|-\dfrac{1}{7}=\dfrac{1}{3}\)
d, \(\dfrac{x+1}{3}=\dfrac{2x-1}{5}\)
1) Thực hiện phép tính nhanh nhất nếu có thể:a) dfrac{2}{7}+dfrac{7}{7}.dfrac{14}{25}b) dfrac{6}{7}+dfrac{5}{7}:5-dfrac{8}{9}c)left(dfrac{-5}{28}+1,75+dfrac{8}{35}right):left(-3dfrac{9}{20}right)d)70,5-528:dfrac{15}{2}e)dfrac{-7}{25}.dfrac{39}{-14}.dfrac{50}{78}
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1) Thực hiện phép tính nhanh nhất nếu có thể:
a)
\(\dfrac{2}{7}+\dfrac{7}{7}.\dfrac{14}{25}\)
b)
\(\dfrac{6}{7}+\dfrac{5}{7}:5-\dfrac{8}{9}\)
c)
\(\left(\dfrac{-5}{28}+1,75+\dfrac{8}{35}\right):\left(-3\dfrac{9}{20}\right)\)
d)\(70,5-528:\dfrac{15}{2}\)
e)\(\dfrac{-7}{25}.\dfrac{39}{-14}.\dfrac{50}{78}\)