Tính:
17.13 =?
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= 189+65+378+104+567+143+756+182+945+221+1134
=4684
\(3\cdot63+5\cdot13+6\cdot63+8\cdot13+9\cdot63+11\cdot13+12\cdot63+14\cdot13+15\cdot63+17\cdot13+18\cdot63\)\(=\left(3\cdot63+6\cdot63+9\cdot63+12\cdot63+15\cdot63+18\cdot63\right)+\left(5\cdot13+8\cdot13+11\cdot13+14\cdot13+17.13\right)\)\(=63\left(3+6+9+12+15+18\right)+13\left(5+8+11+14+17\right)\)
\(=63\cdot63+15\cdot55\)
\(=3969+825\)
\(=4794\)
\(\dfrac{3}{17}\left(\dfrac{13}{15}+\dfrac{2}{15}\right)=\dfrac{3}{17}\times\dfrac{15}{15}=\dfrac{3}{17}\times1=\dfrac{3}{17}\)
\(\frac{-17.13+17.2}{11.2-11.19}=\frac{17.\left(-13\right)+17.2}{11.\left(2-9\right)}=\frac{17.\left(-11\right)}{11.\left(-7\right)}=\frac{17}{7}\)
\(\frac{-17.13+17.2}{11.2-11.19}=\frac{-17\left(13-2\right)}{11\left(2-19\right)}=\frac{-17.11}{11.\left(-17\right)}=1\)
_17*13+17\(\frac{-17\cdot13+17\cdot2}{11\cdot2-11\cdot19}=\frac{-221+34}{22-209}=\frac{-187}{-187}=\frac{1}{1}=1\)
\(\frac{3.7.8.13}{14\cdot15\cdot26}=\frac{3\cdot7\cdot8\cdot13}{2\cdot7\cdot3\cdot5\cdot2\cdot13}=\frac{8}{5\cdot2\cdot2}=\frac{8}{20}=\frac{2}{5}\)
\(\frac{3.7.8.13}{14.15.26}=\frac{3.7.2^3.13}{2.7.3.5.13.2}=\frac{1.7.2.1}{1.1.1.5.1.1}=\frac{14}{5}\)
\(\frac{11.8-11.3}{17-6}=\frac{11.\left(8-3\right)}{11}=\frac{11.5}{11}=\frac{1.5}{1}=\frac{5}{1}=5\)
\(\frac{-17.13+17.2}{11.2-11.9}=\frac{-17.13+\left(-17\right).2}{11.\left(2-9\right)}=\frac{-17.\left(-13+2\right)}{11.\left(-7\right)}=\frac{-17.\left(-11\right)}{11.\left(-7\right)}=\frac{-17.\left(-1\right)}{-1.\left(-7\right)}=\frac{17}{7}\)
\(\frac{7}{9.10^2-2.10^2}=\frac{7}{100\left(9-2\right)}=\frac{7}{100.7}=\frac{7}{700}=\frac{1}{100}\)
mình làm được tới đó thôi, hihi.
=221nha
chuc ban hoc gioi
17 x 13 = 221
tk nha các bạn , chúc các bạn học giỏi