Bài 1: Tập hợp Q các số hữu tỉ
Các câu hỏi tương tự
a) 12,5.left(-dfrac{5}{7}right)+1,5.left(-dfrac{5}{7}right)
b) left(-dfrac{2}{5}-dfrac{3}{7}right):dfrac{4}{5}+left(-dfrac{1}{5}+dfrac{3}{7}right);dfrac{4}{5}
c) 12.left(-dfrac{2}{3}right)^2+dfrac{4}{3}
d) 1:left(dfrac{2}{3}-dfrac{3}{4}right)^2
e) 15.left(-dfrac{2}{3}right)^{^{ }2}-dfrac{7}{3}
f) dfrac{5^4.20^4}{25^5.4^5}
Đọc tiếp
a) 12,5.\(\left(-\dfrac{5}{7}\right)+1,5.\left(-\dfrac{5}{7}\right)\)
b) \(\left(-\dfrac{2}{5}-\dfrac{3}{7}\right):\dfrac{4}{5}+\left(-\dfrac{1}{5}+\dfrac{3}{7}\right);\dfrac{4}{5}\)
c) \(12.\left(-\dfrac{2}{3}\right)^2+\dfrac{4}{3}\)
d) \(1:\left(\dfrac{2}{3}-\dfrac{3}{4}\right)^2\)
e) \(15.\left(-\dfrac{2}{3}\right)^{^{ }2}-\dfrac{7}{3}\)
f) \(\dfrac{5^4.20^4}{25^5.4^5}\)
\(\dfrac{4}{5}-\left(\dfrac{-2}{7}\right)-\dfrac{7}{10}\)
\(\left(6-\dfrac{2}{3}+\dfrac{1}{2}\right)-\left(5+\dfrac{5}{3}-\dfrac{3}{2}\right)-\left(3-\dfrac{7}{3}+\dfrac{5}{2}\right)\)
1.Tìm x :
a,frac{1}{5.6}+frac{1}{6.7}+...+frac{1}{xleft(x+1right)}frac{13}{90}
b,frac{1}{1.4}+frac{1}{4.7}+frac{1}{7.10}+...+frac{1}{xleft(x+3right)}frac{49}{148}
c,frac{7}{left(x+3right)left(x+10right)}+frac{11}{left(x+10right)left(x+21right)}+frac{1}{left(x+21right)left(x+34right)}frac{x}{left(x+3right)left(x+34right)}
d,frac{3}{left(x-4right)left(x-7right)}+frac{6}{left(x-7right)left(x-13right)}+frac{15}{left(x-13right)left(x-28right)}-frac{1}{x-38}frac{-1}{20}
Đọc tiếp
1.Tìm x :
a,\(\frac{1}{5.6}+\frac{1}{6.7}+...+\frac{1}{x\left(x+1\right)}=\frac{13}{90}\)
b,\(\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+...+\frac{1}{x\left(x+3\right)}=\frac{49}{148}\)
c,\(\frac{7}{\left(x+3\right)\left(x+10\right)}+\frac{11}{\left(x+10\right)\left(x+21\right)}\)\(+\frac{1}{\left(x+21\right)\left(x+34\right)}=\frac{x}{\left(x+3\right)\left(x+34\right)}\)
d,\(\frac{3}{\left(x-4\right)\left(x-7\right)}+\frac{6}{\left(x-7\right)\left(x-13\right)}\)\(+\frac{15}{\left(x-13\right)\left(x-28\right)}\)\(-\frac{1}{x-38}=\frac{-1}{20}\)
Tìm GTNN của biểu thức:
a) \(\left|x+5\right|+\left|x+17\right|\)
b) \(\left|x+8\right|+\left|x+13\right|+\left|x+50\right|\)
c) \(\left|x+5\right|+\left|x+2\right|+\left|x-7\right|+\left|x-8\right|\)
d) \(\left|x+3\right|+\left|x-2\right|+\left|x-5\right|\)
Tính:
a) left|-1,3right| - left|-3,7right| + left|-dfrac{1}{2}right|
b) left|dfrac{2}{5}right| - left|-0,2right| . left|-7right|
c) ( -15 ) : left|-3right| + left|0,5right|
Các bn giúp mk nhanh nha. Sáng mai mk phải nộp cho thầy r. Mk sẽ tick cho.
Đọc tiếp
Tính:
a) \(\left|-1,3\right|\) - \(\left|-3,7\right|\) + \(\left|-\dfrac{1}{2}\right|\)
b) \(\left|\dfrac{2}{5}\right|\) - \(\left|-0,2\right|\) . \(\left|-7\right|\)
c) ( -15 ) : \(\left|-3\right|\) + \(\left|0,5\right|\)
Các bn giúp mk nhanh nha. Sáng mai mk phải nộp cho thầy r. Mk sẽ tick cho.
Tính nhanh:
\(\left(\dfrac{-3}{7}+\dfrac{4}{11}\right):\dfrac{7}{11}+\left(\dfrac{-4}{7}+\dfrac{7}{11}\right):\dfrac{7}{11}\)
Các bn giúp mk vs nha
Cho \(A=\left(\dfrac{2}{2^2}-1\right).\left(\dfrac{1}{3^2}-1\right).\left(\dfrac{1}{4^2}-1\right)...\left(\dfrac{1}{100^2}-1\right)\)So sánh A với \(-\dfrac{1}{2}\)
\(\dfrac{2}{\left(x-1\right)\left(x-3\right)}\)+\(\dfrac{2}{\left(x-3\right)\left(x-8\right)}+\dfrac{12}{\left(x-8\right)\left(x-20\right)}-\dfrac{1}{x-20}=\dfrac{-3}{4}\)
Tìm Giá trị nhỏ nhất của
a) A=\(\left|2x-49\right|+\left|2x+3\right|\)
b) B= \(\left|3x+5\right|+\left|3x-20\right|+\left|x\right|\)