(-3,2) . \(\frac{-15}{64}\)+(0,8-2\(\frac{4}{15}\)):3\(\frac{2}{3}\)

=\(\frac{3}{4}\)+(-\(\frac{22}{15}\)):\(\frac{11}{3}\)

=\(\frac{3}{4}\)+\(\left(-\frac{22}{15}\right).\frac{3}{11}\)

=\(\frac{3}{4}\)-\(\frac{2}{5}=\frac{7}{20}\)

                    chọn đúng giúp mình nha!

sao bạn có thể viết được hỗn số và phân số?

dễ mà bạn chỉ cần bật ô trả lời chon biểu tượng giống chữ M nằm ngang nhé 

A/   \(\left(15-6\frac{13}{18}\right):11\frac{1}{27}-2\frac{1}{8}:1\frac{11}{40}\)

\(=\left(15-\frac{121}{18}\right):\frac{298}{27}-\frac{17}{8}:\frac{51}{40}\)

\(=\left(\frac{270}{18}-\frac{121}{18}\right):\frac{298}{27}-\frac{17}{8}:\frac{51}{40}\)

\(=\frac{149}{18}:\frac{298}{27}-\frac{17}{8}:\frac{51}{40}\)

\(=\frac{3}{4}-\frac{5}{3}\)

\(=\frac{9}{12}-\frac{20}{12}\)\(=-\frac{11}{12}\)

B/  \(\left(-3,2\right)\cdot-\frac{15}{64}+\left(0,8-2\frac{4}{15}\right):3\frac{2}{3}\)

\(=\left(-3,2\right)\cdot-\frac{15}{64}+\left(0,8-\frac{34}{15}\right):\frac{11}{3}\)

\(=-\frac{3,2}{1}\cdot-\frac{15}{64}+\left(0,8-\frac{34}{15}\right):\frac{11}{3}\)

\(=\frac{48}{64}+\left(0,8-\frac{34}{15}\right):\frac{11}{3}\)

\(=\frac{3}{4}+\left(\frac{12}{15}-\frac{34}{15}\right):\frac{11}{3}\)

\(=\frac{3}{4}+\left(-\frac{22}{15}\right):\frac{11}{3}\)

\(=\frac{3}{4}+\left(-\frac{2}{5}\right)\)

\(=\frac{15}{20}+\left(-\frac{8}{20}\right)\)

\(=\frac{7}{20}\)

=\(\frac{-16}{5}.\frac{-15}{64}+\left(\frac{4}{5}-\frac{34}{15}\right):\frac{7}{2}\)

= \(\frac{-16.\left(-15\right)}{5.64}+\left(\frac{12}{15}-\frac{34}{15}\right).\frac{2}{7}\)

=\(\frac{-1.\left(-3\right)}{1.4}+\left(\frac{-22}{15}\right).\frac{2}{7}\)

=\(\frac{3}{4}-\frac{44}{105}=\frac{315}{420}-\frac{176}{420}=\frac{139}{420}\)

k mình nha

\(\left(-3,2\right).\frac{-15}{64}+\left(0,8-2\frac{4}{15}\right):3\frac{1}{2}\)

\(=0,75+\left(0,8-\frac{34}{15}\right):\frac{7}{2}\)

\(=0,75+\frac{46}{15}:\frac{7}{2}\)

\(=0,75+\frac{46}{15}.\frac{2}{7}\)

\(=0,75+\frac{92}{105}=\frac{683}{420}\)

=3/4+(-2):11/3

=3/4+-6/11

=9/44

mình ko bít

thấy dễ thương thì tk nghe

= 0,75 + ( 0,8 - 34/15 )

= 0,75 + -22/15

= -43/60

\(1\frac{13}{15}\cdot3\cdot(0,5)^2\cdot3+\left[\frac{8}{15}-1\frac{19}{60}:1\frac{23}{24}\right]\)

\(=\frac{28}{15}\cdot3\cdot0,5\cdot0,5\cdot3+\left[\frac{8}{15}-\frac{79}{60}:\frac{47}{24}\right]\)

\(=\frac{28}{5}\cdot0,25\cdot3+\left[\frac{32}{60}-\frac{79}{60}\cdot\frac{24}{47}\right]\)

\(=\frac{28}{5}\cdot\frac{25}{100}\cdot3+\left[\frac{32}{60}-\frac{158}{235}\right]\)

\(=\frac{28}{5}\cdot\frac{1}{4}\cdot3+\frac{-98}{705}=\frac{7}{5}\cdot1\cdot3+\frac{-98}{705}\)

Đến đây là tính dễ rồi :v

\((-3,2)\cdot\frac{-15}{64}+\left[0,8-2\frac{4}{15}\right]:1\frac{23}{24}\)

\(=\frac{-32}{10}\cdot\frac{-15}{64}+\left[\frac{8}{10}-\frac{34}{15}\right]:\frac{47}{24}\)

\(=\frac{-32\cdot(-15)}{10\cdot64}+\left[\frac{4}{5}-\frac{34}{15}\right]:\frac{47}{24}\)

\(=\frac{-1\cdot(-3)}{2\cdot2}+\frac{4\cdot3-34}{15}:\frac{47}{24}\)

\(=\frac{3}{4}+\frac{-22}{15}:\frac{47}{24}\)

\(=\frac{3}{4}+\frac{-517}{180}=\frac{-191}{90}\)

Bài 2 : \(\frac{2\cdot(-13)\cdot9\cdot10}{(-3)\cdot4\cdot(-5)\cdot26}=\frac{1\cdot(-1)\cdot3\cdot2}{(-1)\cdot2\cdot(-1)\cdot2}=\frac{1\cdot3}{-1\cdot2}=\frac{3}{-2}=\frac{-3}{2}\)

\(\frac{15\cdot8+15\cdot4}{12\cdot3}=\frac{15\cdot(8+4)}{12\cdot3}=\frac{15\cdot12}{12\cdot3}=\frac{15}{3}=5\)

\(=\frac{7}{20}\)

ủng hộ nhé

\(\frac{\left(-3,2\right).\left(-15\right)}{64}+\frac{8}{10}-\frac{34}{15}:\frac{11}{3}\)

=\(\frac{3}{4}+\frac{8}{10}-\frac{34}{55}\)

Rồi bạn QĐMS và cộng vào nhé.

Chúc bạn học tốt!

a/ (-3,2).\(\frac{-15}{64}\)+(0,8-2\(\frac{4}{5}\)):1\(\frac{23}{24}\)

=(\(\frac{-16}{5}\)).\(\frac{-15}{64}\)+(\(\frac{4}{5}\)-\(\frac{14}{5}\)):\(\frac{47}{24}\)

=(\(\frac{-16}{5}\)).\(\frac{-15}{64}\)+(-2):\(\frac{47}{24}\)

= \(\frac{3}{4}\)+\(\frac{-48}{47}\)

=\(\frac{-51}{188}\)

b/ 1\(\frac{13}{15}\).3.(0,5)\(^2\).3+(\(\frac{8}{15}\)-1\(\frac{19}{60}\)):1\(\frac{23}{24}\)

= \(\frac{28}{15}\).3.\(\frac{1}{4}\).3+(\(\frac{8}{15}\)-\(\frac{79}{60}\)):\(\frac{47}{24}\)

= \(\frac{28}{15}\).3.\(\frac{1}{4}\).3+(\(\frac{-47}{60}\)):\(\frac{47}{24}\)

= \(\frac{28}{5}\).\(\frac{1}{4}\).3+(\(\frac{-47}{60}\)):\(\frac{47}{24}\)

= \(\frac{7}{5}\).3+(\(\frac{-47}{60}\)):\(\frac{47}{24}\)

= \(\frac{21}{5}\)+(\(\frac{-47}{60}\)):\(\frac{47}{24}\)

= \(\frac{21}{5}\)+(\(\frac{-2}{5}\))

= \(\frac{19}{5}\)

mk làm hơi dài dòng chút 

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