a vab voi a>b va thao man 3.(a+b)=5.a(a-b). Tim thuong cua a va b

 biết lộn sao còn đăng

đó là tớ ghi hồi nãy giờ ghi đúng rồi

\(\dfrac{44\cdot52\cdot60}{11\cdot13\cdot15}=\dfrac{4\cdot11\cdot4\cdot13\cdot4\cdot15}{11\cdot13\cdot15}=4^3=64\)

(44x52x60):(11x13x15)
= ( 44 : 11) x ( 52 : 13 ) x ( 60 : 15 )
=  4 x 4 x 4
= 64
Nếu có gì sao, sửa hộ mình nha!☺❤

123x456456-456x123123

=56144088-56144088

=0

tk nhé

\(=5.22\left(3134+275\cdot2+1.079\cdot4\right)\)

\(=5.22\cdot3688.316=19253.00952\)

\(1\dfrac{13}{15}.0,75-\left(\dfrac{11}{20}+25\%\right):\dfrac{3}{7}\)

\(\Leftrightarrow\) \(\left\{{}\begin{matrix}=\dfrac{28}{15}.\dfrac{3}{4}-\left(\dfrac{11}{20}+\dfrac{1}{4}\right):\dfrac{7}{3}\\=\dfrac{7}{5}-\dfrac{4}{5}.\dfrac{3}{7}\\=\dfrac{7}{5}-\dfrac{12}{35}\\=\dfrac{37}{35}\end{matrix}\right.\)\(\Rightarrow\) \(kết\) \(quả\) \(=\dfrac{37}{35}\) 

Đáp số là 0 nhé

LAM CAC BUOC CHI TIET DI BAN

\(\Rightarrow C=\left(-\dfrac{3}{4}\right)\cdot\left(-\dfrac{8}{9}\right)\cdot\left(-\dfrac{15}{16}\right)\cdot\cdot\cdot\cdot\left(-\dfrac{399}{400}\right)\)

         \(=-\left(\dfrac{3}{4}\cdot\dfrac{8}{9}\cdot\dfrac{15}{16}\cdot\cdot\cdot\cdot\dfrac{399}{400}\right)\)

         \(=-\left(\dfrac{1\cdot3}{2\cdot2}\cdot\dfrac{2\cdot4}{3\cdot3}\cdot\dfrac{3\cdot5}{4\cdot4}\cdot\cdot\cdot\cdot\dfrac{19\cdot21}{20\cdot20}\right)\)

         \(=-\left(\dfrac{1\cdot2\cdot3\cdot4\cdot...\cdot19}{2\cdot3\cdot4\cdot...\cdot20}\cdot\dfrac{3\cdot4\cdot5\cdot...\cdot21}{2\cdot3\cdot4\cdot...\cdot20}\right)\)

         \(=-\left(\dfrac{1}{20}\cdot\dfrac{21}{2}\right)=-\dfrac{21}{40}\)