\(4\frac{2}{3}\div y=2\frac{5}{8}\)
Tính nhanh
a) \(\frac{2}{3}\div\frac{4}{9}+\frac{1}{3}\div\frac{4}{9}=\)
b) \(\frac{9}{8}\div\frac{5}{7}-\frac{1}{8}\div\frac{5}{7}=\)
c) \(\frac{2}{5}\div\frac{7}{3}-\frac{2}{5}\div\frac{1}{3}=\)
d) \(\frac{3}{7}\div\frac{7}{3}+\frac{3}{7}\div\frac{9}{4}=\)
a)\(\frac{2}{3}:\frac{4}{9}+\frac{1}{3}:\frac{4}{9}\)
=\(\frac{4}{9}:\left(\frac{2}{3}+\frac{1}{3}\right)\)
=\(\frac{4}{9}:1=\frac{4}{9}\)
b
tính bằng cách thuận tiện
a. \(\frac{1}{2}\times\frac{2}{3}\div\frac{4}{3}\times\frac{4}{5}\div\frac{6}{5}\times\frac{6}{7}\div\frac{7}{8}\times\frac{8}{9}\div\frac{10}{9}\)
b.\(\frac{27}{49}\times\frac{49}{50}\times\frac{15}{51}\times(\frac{5}{10}-\frac{1}{2})\)
(7x6=5+2+6x7) =
Tính nhanh:
A=\(\left(\frac{2}{5}+\frac{2}{9}+\frac{2}{11}\div\frac{7}{5}+\frac{7}{9}+\frac{7}{11}\right)\div\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{5}\div\frac{7}{6}-\frac{7}{8}+\frac{7}{10}\right)\)
a= (\(\frac{2}{5}\)+\(\frac{2}{9}\)+\(\frac{2}{11}\)\(\times\)\(\frac{5}{7}\)\(+\frac{7}{9}\)\(+\frac{7}{11}\)\()\)
\(\frac{2}{3}-\frac{4}{7}x=\frac{9}{8}-0,125\)
\(\frac{3}{x-5}=\frac{-4}{x+2}\)
\(\hept{\begin{cases}\\\end{cases}2\frac{2}{5}+\frac{3}{5}x=\frac{3}{4}}\)
3/x-5 = -4/x+2
=> 3(x+2) = -4(x-5)
=> 3x + 6 = -4x + 20
=> 3x + 4x = 20 - 6
=> 7x - 14
=> x = 2
Bài trên dễ tự làm
\(\frac{3}{x-5}=\frac{-4}{x+2}\)
\(\Rightarrow3\cdot(x+2)=-4\cdot(x-5)\)
\(\Rightarrow3x+6=-4x-20\)
\(\Rightarrow-4x-3x=6-20\)
\(\Rightarrow-7x=-14\Rightarrow x=2\)
\(2\frac{2}{5}+\frac{3}{5}x=\frac{3}{4}\)
\(\Rightarrow\frac{12}{5}+\frac{3}{5}x=\frac{3}{4}\)
Tự làm nốt
Mình bận một số công việc cho mk xin lỗi
a ) 4\(\frac{5}{9}\)\(\div\)\((-\frac{5}{7})\)\(+\frac{4}{9}\div\frac{\left(-5\right)}{7}\)
b ) \((-\frac{3}{5}+\frac{4}{9})\div\frac{7}{11}+(\frac{-2}{5}+\frac{5}{9})\div\frac{7}{11}\)
c ) \(\frac{6}{7}\div(\frac{3}{26}-\frac{3}{13})+\frac{6}{7}\div(\frac{1}{10}-\frac{8}{5})\)
d ) \(A=(2+4+6+........+100)\orbr{\begin{cases}3\\5\end{cases}}\div0,7+3(\frac{-2}{7})]\div(\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+......+\frac{1}{100})\)
Giải cụ thể hộ mk vs
\(a,4\frac{5}{9}:\frac{\left(-5\right)}{7}+\frac{4}{9}:\frac{-5}{7}\)
\(=\frac{41}{9}.\frac{-7}{5}+\frac{4}{9}.\frac{-7}{5}\)
\(=\frac{-7}{5}.\left(\frac{41}{9}+\frac{4}{9}\right)\)
\(=-\frac{7}{9}.5\)
\(=-7\)
a)Bn Kaito Kid làm rùi!
B)Không viết lại đề
\(=\frac{11}{7}\cdot\left(-\frac{3}{5}+\frac{4}{9}-\frac{2}{5}+\frac{5}{9}\right)=\frac{11}{7}\cdot0=0\)
c)Không viết lại đề
\(A=\left(2+4+...+100\right)\left(\frac{3}{5}\cdot\frac{10}{7}-\frac{6}{7}\right):\left(\frac{1}{2}+\frac{1}{4}+...+\frac{1}{100}\right)\)
\(=\left(2+4+6+...+100\right)\cdot0\cdot\left(\frac{1}{2}+\frac{1}{4}+...+\frac{1}{100}\right)=0\)
\(=\frac{7}{6}\cdot\left(\frac{3}{26}-\frac{3}{13}+\frac{1}{10}-\frac{8}{5}\right)=\frac{7}{6}\left(\frac{-3}{26}+\frac{-17}{10}\right)=\frac{7}{6}\cdot\frac{236}{130}=\frac{413}{195}\)
D)
Dòng trên chữ D) là phần c)
Dưới phần c) là phần d) nha!(Lỗi đánh máy)
\(4\times\left(\frac{1}{4}\right)^2+25\times\left[\left(\frac{3}{4}\right)^3\div\left(\frac{5}{4}\right)^3\right]\div\left(\frac{3}{2}\right)^3\)
\(2^3+3\times\left(\frac{1}{2}\right)^0-1+\left[\left(-2\right)^2\div\frac{1}{2}\right]-8\)
\(4.\left(\frac{1}{4}\right)^2+25\left[\left(\frac{3}{4}\right)^3:\left(\frac{5}{4}\right)^3\right]:\left(\frac{3}{2}\right)^3=4.\frac{1}{16}+25\left(\frac{27}{64}.\frac{64}{125}\right).\frac{8}{27}\)
\(=\frac{1}{4}+25.\frac{27}{125}.\frac{8}{27}=\frac{1}{4}+\frac{8}{5}=\frac{37}{20}\)
\(2^3+3\left(\frac{1}{2}\right)^0-1+\left[\left(-2\right)^2:\frac{1}{2}\right]-8=8+3-1+4.2-8=10\)
tính
a, \(\frac{4\frac{1}{2}.5\frac{2}{3}}{6\frac{2}{4}}\)
b, \(\frac{-1\div1.\frac{1}{5}}{3\frac{1}{8}\div6\frac{2}{3}}\)\(\div\)\(\frac{4\frac{7}{4}\div13}{5\div1\frac{7}{8}}\)
a)\(\frac{\frac{51}{2}}{\frac{13}{2}}\)=\(\frac{51}{13}\)
b)\(-\frac{5}{\frac{15}{32}}:\frac{\frac{23}{52}}{\frac{8}{3}}=-\frac{13312}{207}\)
cau 1
nhóm 1\(\frac{1}{2}\) voi \(\frac{1}{2}\) tiếp ta sẽ có là 2+3+....+51
cau 2
co \(^{abc^2}\)=576
suy ra abc=24
mà ab=-6 nên c=-4
bc =12 nên a=2
ac=-8 nên b=-3
chúc bạn học giỏi nhớ trả lời hộ câu hỏi của mình nhé
Thực hiện phép tính: E =\(\frac{0,8:\left(\frac{4}{5}.1,25\right)}{0,64-\frac{1}{25}}+\frac{\left(1,08-\frac{2}{25}\right):\frac{4}{7}}{\left(6\frac{5}{9}-3\frac{1}{4}\right).2\frac{2}{17}}\)+ (1,2 . 0,5 ) : \(\frac{4}{5}\)
Bấm máy tính:
E = \(\frac{4}{3}+\frac{1}{4}+\frac{3}{5}:\frac{4}{5}\)
E = \(\frac{4}{3}+\frac{1}{4}+\frac{3}{4}\)
E = \(\frac{7}{3}\)
Vậy E = \(\frac{7}{3}\)