Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
ta có x, y , z, t # 0
lấy y.t : y.z = 48/24 = 2
hay t = 2.z kết hợp điều này với t.z = 32 ta sẽ có
t = 4 vậy z =8, y = 3 , x =4
t = -4. z = -8 , y = -3 , x= -4
Trả lời
\(A=\frac{7}{12}+\frac{5}{12}\div6-\frac{11}{36}\)
\(A=\frac{7}{12}+\frac{5}{12}\times\frac{1}{6}-\frac{11}{36}\)
\(A=\frac{7}{12}+\frac{5}{72}-\frac{11}{36}\)
\(A=\frac{25}{72}\)
\(B=12\frac{1}{3}-\frac{5}{7}\div\left(24-23\frac{5}{7}\right)\)
\(B=\frac{37}{3}-\frac{5}{7}\div\left(24-\frac{166}{7}\right)\)
\(B=\frac{37}{3}-\frac{5}{7}\div\frac{2}{7}\)
\(B=\frac{37}{3}-\frac{5}{7}\times\frac{7}{2}\)
\(B=\frac{37}{3}-\frac{5}{2}\)
\(B=\frac{59}{6}\)
Bài làm:
Ta có:
\(A=\frac{7}{12}+\frac{5}{12}\div6-\frac{11}{36}\)
\(A=\frac{7}{12}+\frac{5}{72}-\frac{11}{36}\)
\(A=\frac{42+5-22}{72}=\frac{25}{72}\)
và
\(B=12\frac{1}{3}-\frac{5}{7}\div\left(24-23\frac{5}{7}\right)\)
\(B=\frac{37}{3}-\frac{5}{7}\div\left(24-23-\frac{5}{7}\right)\)
\(B=\frac{37}{3}-\frac{5}{7}\div\left(1-\frac{5}{7}\right)\)
\(B=\frac{37}{3}-\frac{5}{7}+1\)
\(B=\frac{265}{21}\)
Lời giải:
a)
$\frac{2}{12}+\frac{7}{-42}=\frac{1}{6}+\frac{-1}{6}=0$
b)
$\frac{24}{40}+\frac{-14}{35}=\frac{3}{5}+\frac{-2}{5}=\frac{1}{5}$
c)
$\frac{-14}{49}+\frac{12}{30}=\frac{-2}{7}+\frac{2}{5}=\frac{4}{35}$
d)
$\frac{6}{-21}+\frac{-9}{36}=\frac{-2}{7}+\frac{-1}{4}=\frac{-15}{28}$
a, Ta có : \(\frac{xy^2}{yz}=\frac{xyy}{yz}=\frac{xy}{z}.\frac{y}{y}=\frac{xy}{z}.1=\frac{xy}{z}\)
b, Ta có : \(\frac{7x-21}{14x-42}=\frac{7\left(x-3\right)}{14\left(x-3\right)}=\frac{7}{14}=\frac{1}{2}\)
c, Ta có : \(\frac{\overline{ab}}{abab}=\frac{10a+b}{1000a+100b+10a+b}=\frac{10a+b}{100\left(10a+b\right)+1\left(10a+b\right)}\)
\(=\frac{10a+b}{\left(100+1\right)\left(10a+b\right)}=\frac{1}{101}\)
d, Ta có : \(\frac{\frac{4}{11}-\frac{12}{31}+\frac{16}{59}}{\frac{3}{11}-\frac{9}{31}+\frac{12}{59}}=\frac{4\left(\frac{1}{11}-\frac{3}{31}+\frac{4}{59}\right)}{3\left(\frac{1}{11}-\frac{3}{31}+\frac{4}{59}\right)}=\frac{4}{3}\)
\(A=\frac{7}{12}+\frac{5}{12}:6-\frac{1}{36}\)
\(=\frac{7}{12}+\frac{5}{72}-\frac{11}{36}\)
\(=\frac{42}{72}+\frac{5}{72}-\frac{22}{72}\)
\(=\frac{25}{72}\)