(150 x 35 x 10) :25 = 52500 : 25 = 2100

(450 x480 x 44) : (15 x 21 x11) = 9504000 : 3465 = \(\frac{9504000}{3465}=\frac{19200}{7}\)

\(\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{22}{28}\)

\(=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}\times\dfrac{14}{11}\)

\(=\dfrac{11\times12\times13\times14}{12\times13\times14\times11}\)

\(=1\)

=================

\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}\)

\(=\dfrac{7}{10}\times\left(3+5+2\right)\)

\(=\dfrac{7}{10}\times10=7\)

\(\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{22}{28}\)

\(=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{11}{14}\)

\(=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}\times\dfrac{14}{11}\)

\(=\dfrac{11\times12\times13\times14}{12\times13\times11\times14}\)

\(=1\)

\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}\)

\(=\dfrac{7}{10}\times\left(3+5+2\right)\)

\(=\dfrac{7}{10}\times10\)

\(=7\)

64.4+18.4+9.2.4=400

64 x 4 + 18 x 4 + 9 x 2 x 4 = 64 x 4 + 18 x 4 + 18 x 4 = (64 + 18 + 18) x 4 = 100 x 4 = 400

400 tk m nhé

3/2 x 4/9 x 2/4

= 24/72

= 1/3

`3/2xx4/9xx2/4=[3xx4xx2]/[2xx3xx3xx4]=1/3`

3/2x4/9x2/4

=2/3x2/4

=4/12

=1/3

đề bài

35.11.0,1.0,25.100.(3:0,4-7,5)

2 phần 3

ko biet vi em moi hoc lop 3 thoi hihi

\(\frac{2}{3}.\frac{6}{11}-\frac{4}{11}.\frac{10}{15}+\frac{4}{6}.\frac{9}{11}\)

= \(\frac{2}{3}.\frac{6}{11}-\frac{4}{11}.\frac{2}{3}+\frac{2}{3}.\frac{9}{11}\)

= \(\frac{2}{3}.\left(\frac{6}{11}-\frac{4}{11}+\frac{9}{11}\right)\)

= \(\frac{2}{3}.1=\frac{2}{3}\)