Sửa đề: \(D=\dfrac{\dfrac{12}{19}-12+\dfrac{12}{47}}{\dfrac{6}{19}-6+\dfrac{6}{47}}=\dfrac{12\left(\dfrac{1}{19}-1+\dfrac{1}{47}\right)}{6\left(\dfrac{1}{19}-1+\dfrac{1}{47}\right)}=2\)

\(12\cdot47+47\cdot7+47\)

\(=47\cdot\left(12+7+1\right)\)

\(=47\cdot20\)

\(=940\)

\(12\times47+47\times7+47=47\times\left(12+7+1\right)=47\times20=940\)

\(12\times47+47\times7+47=47\times\left(12+7+1\right)=17\times20=340\)

=(-40)

-40

\(-\left(32+47\right)+96-168+47\)

\(=-32+\left(-47\right)+96-168+47\)

\(=\left(-32-168\right)+\left(-47+47\right)+96\)

\(=-200+0+96\)

\(=-104\)

\(-\left(32+47\right)+96-168+47\)

\(=-32+\left(-47\right)+96-168+47\)

\(=\left(-47+47\right)+\left(-32-168\right)+96\)

\(=0-200+96\)

\(=-104\)

\(-\left(32+47\right)+96-168+47\)

\(=-32+\left(-47\right)+96-168+47\)

\(=\left(-32-168\right)+\left(-47+47\right)+96\)

\(=-200+0+96\)

\(=-104\)

( - 12 ) . 47 + ( - 12 ) . 52 - ( -12)

= ( - 12 ) . ( 47 + 52 - 1 )

= ( - 12 ) . 98

= - 1176

a: \(\dfrac{12}{49}< \dfrac{13}{49}< \dfrac{13}{47}\)

b: \(\dfrac{12}{47}>\dfrac{19}{47}>\dfrac{19}{77}\)

a/ so sánh bằng 12/47

b/ chưa tìm ra

a) Ta chọn phân số \(\dfrac{12}{47}\) là phân số trung gian, ta có :

\(\dfrac{12}{49}< \dfrac{12}{47};\dfrac{13}{47}>\dfrac{12}{47}\Rightarrow\dfrac{12}{49}< \dfrac{13}{47}\)

\(\dfrac{3}{41}-\dfrac{12}{47}+\dfrac{27}{53}+\dfrac{4}{41}-\dfrac{16}{47}+\dfrac{36}{53}\)

\(=\left(\dfrac{3}{41}+\dfrac{4}{41}\right)-\left(\dfrac{12}{47}+\dfrac{16}{47}\right)+\left(\dfrac{27}{53}+\dfrac{36}{53}\right)\)

\(=\dfrac{7}{41}-\dfrac{28}{47}+\dfrac{63}{53}\)

\(=-\dfrac{819}{1927}+\dfrac{63}{53}\)

≃\(0,8\)

720-300sao=400 được.

a, 47 -[( 45.2 mũ 4- 5 mũ 2.12):14]

=47-[(45.16-25.12) :14]

=47-[(720 -300):14]

=47-[ 420:14]

=47-30= 17

Xong rồi nè! Chúc bạn thi tốt nha....!

sai roi

\(\frac{-35}{47}-\left(\frac{25}{13}-\frac{35}{47}\right)+\frac{12}{13}\)

\(=\frac{-35}{47}-\frac{25}{13}+\frac{35}{47}+\frac{12}{13}\)

\(=\left(\frac{-35}{47}+\frac{35}{47}\right)+\left(\frac{-25}{13}+\frac{12}{13}\right)\)

\(=0-1\)

\(=-1\)

_Chúc bạn học tốt_

\(\frac{-35}{47}-\left(\frac{25}{13}-\frac{35}{47}\right)+\frac{12}{13}\)

=\(\frac{-35}{47}-\frac{720}{611}+\frac{12}{13}\)

=\(-1\)

        \(-\frac{35}{47}-\left(\frac{25}{13}-\frac{35}{47}\right)+\frac{12}{13}\)............ k cho mik nhé!  ...............

\(=\)\(-\frac{35}{47}-\frac{25}{13}+\frac{35}{47}+\frac{12}{13}\)

\(=-\frac{35}{47}+\frac{35}{47}-\frac{25}{13}+\frac{12}{13}\)

\(=-\frac{25}{13}+\frac{12}{13}\)\(=-\frac{13}{13}=-1\)

Em nến gõ bằng công thức toán học em nhé. Như vậy mọi người nới hiểu đúng đề bài để trợ giúp cho em một cách tốt nhất em ạ!