a) \(\frac{31}{17}+\frac{-5}{13}+\frac{-8}{13}-\frac{14}{17}\)
\(=\left(\frac{31}{17}-\frac{14}{17}\right)+\left(\frac{-5}{13}+\frac{-8}{13}\right)\)
\(=1+\left(-1\right)\)
\(=0\)
b) \(\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{11}+\frac{5}{7}\)
\(=\frac{-5}{7}.\left(\frac{2}{11}+\frac{9}{11}\right)+\frac{5}{7}\)
\(=\frac{-5}{7}.1+\frac{5}{7}\)
\(=\frac{-5}{7}+\frac{5}{7}\)
\(=0\)
Tìm x:
\(-\frac{5}{17}+\frac{3}{17}\le\frac{x}{17}\le\frac{13}{17}+-\frac{11}{17}\)
\(\frac{5}{6}+-\frac{7}{8}\le\frac{x}{24}\le-\frac{5}{12}+\frac{5}{8}\)
\(\frac{8}{17}+\frac{5}{17}< \frac{x}{17}< \frac{6}{17}+\frac{9}{17}\)
\(-\frac{6}{7}+\frac{3}{35}< \frac{x}{35}\le-\frac{2}{5}+\frac{3}{7}\)
ai nhanh và đúng mk tick
GIÚP MÌNH VỚI Ạ MÌNH ĐANG CẦN GẤP MAI PHẢI CÓ BÀI RỒI ( AI NHANH VÀ ĐÚNG 1 TICK NHA)( dấu nhân là dấu chấm (. ) nnha các bạn
1. tính giá trí biểu thức sau 1 cách hợp lý :
a, \(\frac{3}{8}+\frac{11}{13}-\frac{9}{13}\)
b, \(\frac{2}{7}.\left(\frac{5}{9}+\frac{4}{9}\right)+\frac{2}{7}\)
c, \(\frac{3}{11}.\left(\frac{3}{5}-\frac{5}{3}\right)-\frac{3}{10}.\left(\frac{1}{3}-\frac{2}{5}\right)\)
d,\(\frac{-3}{4}.\frac{5}{6}+\frac{1}{6}.\frac{-3}{4}\)
e,\(\frac{3}{17}.\frac{11}{23}+\frac{3}{23}.\frac{31}{17}-\frac{3}{17}.\frac{19}{23}\)
g, \(\frac{3}{7}.\frac{-5}{12}+\frac{11}{17}:\frac{5}{-12}\)
\(\frac{2}{7}.5\frac{1}{4}-\frac{2}{7}.3\frac{1}{4}\)
\(11\frac{3}{13}\)\(11\frac{3}{13}-\left(2\frac{4}{7}+5\frac{3}{13}\right)\)
\(3\frac{14}{19}+\frac{13}{17}+\frac{35}{43}+6\frac{5}{19}+\frac{8}{43}\)
\(\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{11}+1\frac{5}{7}\)
a) Tính nhanh \(A=\frac{1003\cdot2005-1002}{1003+2005\cdot1002}\cdot\frac{5-\frac{5}{11}+\frac{5}{7}-\frac{5}{17}+\frac{5}{2004}}{\frac{13}{2004}-\frac{13}{17}+\frac{13}{7}-\frac{13}{11}+13}\)
b) So sánh \(2002^{303}\)và \(303^{202}\); \(31^{11}\)và \(17^{14}\)
Bài 1: tính nhanh
a)\(6\frac{4}{5}-\left(1\frac{2}{3}+3\frac{4}{5}\right)\)
b)\(\left(\frac{-4}{5}+\frac{4}{3}\right)+\left(\frac{-5}{4}+\frac{14}{5}\right)-\frac{7}{3}\)
c)\(\frac{8}{3}.\frac{2}{5}.\frac{3}{8}.10\frac{19}{92}\)
d)\(\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{14}+1\frac{5}{7}\)
e)\(\frac{12}{19}.\frac{7}{15}.\frac{-13}{17}.\frac{19}{12}.\frac{17}{13}\)
Thực hiện phép tính(tính nhanh nếu có thể):
\(a.\frac{-13}{7}+\left(\frac{14}{23}+\frac{13}{17}\right)\)
\(b.\frac{6}{7}+\frac{5}{8}:5-\frac{3}{16}\left(-2\right)^2\)
\(c.N=\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{11}+1\frac{5}{7}\)
Tính theo cách lớp 6 :
\(\left(a\right)-\frac{3}{7}\div\frac{11}{5}+-\frac{3}{7}\div\frac{11}{6}+\frac{9}{7}\)
\(\left(b\right)\frac{4}{13}+-\frac{11}{5}+\frac{9}{13}+\frac{6}{5}-75\%\)
\(\left(c\right)-\frac{19}{17}\times\frac{4}{7}+\frac{19}{17}\times-\frac{3}{7}+1\frac{2}{17}\)
Làm được bao nhiêu hay bấy nhiêu ! Làm hết 3 tick, làm 2 câu 2 tick, 1 câu 1 tick. Sai ko tính
\(\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{14}+\frac{12}{7}\)
\(\frac{12}{19}.\frac{7}{15}.\frac{-13}{17}.\frac{19}{12}\frac{17}{13}.\)
Giúp mình với ạ !!
Tính
\(1\frac{5}{7}-\frac{5}{7}.\frac{2}{11}-\frac{5}{7}.\frac{9}{11}\)
\(\frac{3}{11}.\frac{7}{19}.\frac{17}{11}.\frac{3}{9}-\frac{3}{19}.\frac{15}{11}\)
\(\frac{5}{11}.\frac{18}{29}-\frac{5}{11}.\frac{8}{29}+\frac{5}{11}.\frac{19}{26}\)
\(\frac{17}{23}.\frac{8}{16}.\frac{27}{17}.80.\frac{3}{4}\)
\(\left(\frac{13}{23}+\frac{1313}{2323}-\frac{131313}{232323}\right).\left(\frac{1}{3}+\frac{1}{4}-\frac{7}{12}\right)\)
