(12/7x4/13)+(12/14x14/26)+(6/7x2/13)
= 48/91 + 6/13 + 12/91
= 90/91 + 12/91
= 102/91
(12/7x4/13)+(12/14x14/26)+(6/7x2/13)
= 48/91 + 6/13 + 12/91
= 90/91 + 12/91
= 102/91
Tìm x:
a) (2,8x - 32) :\(\frac{2}{3}\)=90
b) 4,5 - 2x . \(1\frac{4}{7}\)=\(\frac{11}{14}\)
c) (x+ \(\frac{1}{4}-\frac{1}{3}\) ): (2+\(\frac{1}{6}-\frac{1}{4}\))=\(\frac{7}{46}\)
d)\(\frac{13}{15}-\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{7}{10}\)
1.Tính bằng 2 cách:
a,\(\left(\frac{5}{7}+\frac{9}{7}\right)x\frac{21}{28}\) b,\(\frac{4}{5}x\frac{13}{14}+\frac{13}{14}x\frac{1}{5}\)
Tính nhanh :
\(\frac{12}{13}-\frac{2}{7}+\frac{8}{13}+\frac{6}{13}-\frac{5}{7}\)
\(\frac{5}{14}\)X \(\frac{7}{13}\)X \(\frac{26}{25}\)
TÍNH BẰNG CÁCH THUẬN TIỆN
tính bằng cách thuận tiện nhất
a,\(\frac{6}{7}\cdot\frac{16}{15}\cdot\frac{7}{6}\cdot\frac{21}{32}\)b, \(\frac{21}{17}\cdot\frac{13}{14}\cdot56\cdot\frac{3}{42}\) c,\(\frac{7}{4}\cdot\frac{11}{21}+\frac{11}{21}\cdot\frac{5}{4}\) d,\(\frac{23}{14}\cdot\frac{6}{14}-\frac{9}{14}\cdot\frac{6}{13}\)
tính nhanh
\(\frac{4}{6}\)+\(\frac{7}{13}\)+\(\frac{17}{9}\)+\(\frac{19}{13}\)+\(\frac{1}{9}\)+\(\frac{14}{6}\)
\(\frac{1}{9}\)+\(\frac{7}{12}\)+\(\frac{2}{9}\)+\(\frac{1}{12}\)+\(\frac{4}{12}\)+\(\frac{6}{9}\)
tinh nhanh
12/7 x 4/13 +12/14 x 14/26 -6/7 x 2/13
\(\frac{1+2+3+4+5}{6+7+8+9+10}\)và \(\frac{11+12+13+14+15}{5+6+7+8+9}\)
So sánh nhé các bạn
Tính Bằng cách thuận tiện nhất:
\(\frac{12}{14}\)+\(\frac{15}{20}\)+\(\frac{6}{7}\) +\(\frac{3}{4}\) =?
\(\frac{9}{18}\)x\(\frac{5}{6}\)+\(\frac{2}{9}\)x\(\frac{15}{12}\)=?
\(\frac{12}{9}\)x\(\frac{3}{7}\)+\(\frac{8}{3}\)x\(\frac{10}{14}\)=?
\(\frac{5}{9}\)+\(\frac{2}{7}\)+\(\frac{6}{14}\)+\(\frac{20}{18}\)=?
Ai trả lời đúng mik tick cho !