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18x5x11=90x11=990
10x9x22=90x22=1.980
40x6x35=240x35=8.400
55x8x12x7=440x12x7=5.280x7=36.960
học tốt_
a. \(495:\left(3\times5\times11\right)\)
\(=\left(3\times3\times5\times11\right):\left(3\times5\times11\right)\)
\(=3\times3\times5\times11:3:5:11\)
\(=\left(3:3\right)\times\left(5:5\right)\times\left(11:11\right)\times3\)
\(=1\times1\times1\times3=3\)
b. \(\left(15\times18\times24\right):\left(5\times9\times12\right)\)
\(=15\times18\times24:5:9:12\)
\(=\left(15:5\right)\times\left(18:9\right)\times\left(24:12\right)\)
\(=3\times2\times2\)
\(=12\)
c. \(\left(27+45+18+81\right):9\)
\(=\left(27:9\right)+\left(45:9\right)+\left(18:9\right)+\left(81:9\right)\)
\(=3+5+2+9\)
\(=19\)
a 495 : (3 x 5 x 11)
=495 : 165
= 3
b (15 x 18 x 24) : (5 x 9 x 12)
= (270 x 24) : (45 x 12)
= 6480 : 540
12
c (27 + 45 + 18 + 81) : 9
=171 : 9
=19
\(\frac{18\times5\times11}{10\times9\times22}\)
\(=\frac{9\times2\times5\times11}{5\times2\times9\times11\times2}\)
\(=\frac{1}{2}\)
Vậy : \(\frac{18\times5\times11}{10\times9\times22}=\frac{1}{2}\)
\(\frac{1}{4}+\frac{3}{5}=\frac{17}{20}\)
\(\frac{5}{2}+\frac{7}{9}=\frac{59}{18}\)
\(\frac{3}{2}+\frac{2}{3}=\frac{13}{6}\)
\(\frac{4}{5}+\frac{3}{2}=\frac{23}{10}\)
\(\frac{4}{5}+\frac{3}{15}=\frac{4}{5}+\frac{1}{5}=1\)
\(\frac{2}{3}+\frac{32}{24}=\frac{2}{3}+\frac{4}{3}=2\)
\(\frac{5}{6}+\frac{15}{18}=\frac{5}{6}+\frac{5}{6}=\frac{10}{6}=\frac{5}{3}\)
\(\frac{8}{15}+\frac{2}{3}=\frac{8}{15}+\frac{10}{15}=\frac{18}{15}=\frac{6}{5}\)
\(\frac{3}{7}+\frac{4}{8}=\frac{24}{56}+\frac{28}{56}=\frac{52}{56}=\frac{13}{14}\)
_HT_
\(\dfrac{3}{4}+\dfrac{1}{8}+\dfrac{7}{8}+\dfrac{5}{4}=\left(\dfrac{3}{4}+\dfrac{5}{4}\right)+\left(\dfrac{1}{8}+\dfrac{7}{8}\right)\\ =2+1=3\)
\(\frac{6}{9}+\frac{5}{7}+\frac{1}{3}+\frac{4}{14}\)
\(=\left(\frac{6}{9}+\frac{1}{3}\right)+\left(\frac{5}{7}+\frac{4}{14}\right)\)
\(=1+1\)
\(=2\)
bài 4:so sánh
5/2 lớn hơn 3/7
4/3 lớn hơn,3/2 lớn hơn
bài 6:rút gọn các phân số sau:
3/9=1/3 9/12=3/4 8/18=4/9 60/36=10/6 17/34=1/2 17/51=1/3 35/100=7/20 25/100=1/4 8/1000=1/125 24/30=4/5 18/54=1/3 72/42=12/7
đay nhé mk chưa làm hết đc bn viết liền quá mk nhìn khó mà mk hỏi bài 7 là nhân hay cộng vậy?
\(\frac{3.5.11}{10.9.22}=\frac{3.5.11}{5.2.3.3.11.2}=\frac{1}{12}\)