a) ( -18 + 25 ) - ( 125 -18 + 25 )
= -18 + 25 - 125 -18 -25
= ( -18 - 18) + ( 25 - 25 ) - 125
= - 36 + 0 - 125
= 161
b,(1/3-1/4-1/12)x(1/2011-1/2012)
=0x(1/2011-1/2012)
=0
a) ( -18 + 25 ) - ( 125 -18 + 25 )
= -18 + 25 - 125 -18 -25
= ( -18 - 18) + ( 25 - 25 ) - 125
= - 36 + 0 - 125
= 161
b,(1/3-1/4-1/12)x(1/2011-1/2012)
=0x(1/2011-1/2012)
=0
\(\dfrac{0,8:\left(\dfrac{4}{5}.1,25\right)}{0,64-\dfrac{1}{25}}\)+\(\dfrac{\left(100-\dfrac{2}{5}\right):\dfrac{4}{7}}{6.\left(\dfrac{5}{9}-3\dfrac{1}{4}\right).2\dfrac{2}{17}}\)
help me, please
Nhanh lên nha, mai mình đi học rùi
Thank you so much
tìm x,y và z biết
1) \(\dfrac{x+1}{3}=\dfrac{y+2}{4}=\dfrac{z+3}{5}\) và x + y + z = 18
help me!!!!!!!!!!!!!!!!!!!!!!!!!
Chứng minh: \(\dfrac{1}{2^2}+\dfrac{1}{3^2}+\dfrac{1}{4^2}+...+\dfrac{1}{2015^2}+\dfrac{1}{2015}\)
Cho biểu thức: A=\(\dfrac{2}{n-1}\left(n\in Z\right).\)Tìm tất cả các giá trị nguyên của n để A là số nguyên.
Không quy đồng mẫu hãy so sánh a và B biết; A=\(\dfrac{12}{5^{2012}}+\dfrac{18}{5^{2013}}\); B=\(\dfrac{18}{5^{2012}}+\dfrac{12}{5^{2013}}\)
BT3: Tìm x, biết
3) \(\dfrac{3}{4}.x-\dfrac{5}{3}.x=\dfrac{7}{12}\)
4) \(x-\dfrac{1}{7}=\) \(\dfrac{\dfrac{4}{2011}-\dfrac{4}{2013}+\dfrac{4}{99}}{\dfrac{5}{2011}-\dfrac{5}{2013}+\dfrac{5}{99}}+\dfrac{1}{2}\)
Các bạn giúp mk nhé
tính giá trị biểu thức
a,\(\dfrac{298}{719}:(\dfrac{1}{4}+\dfrac{1}{12}+\dfrac{1}{3})-\dfrac{2011}{2012}\)
b,\(\dfrac{27.18+27.103-120.27}{15.33+33.12}\)
Thực hiện phép tính( hợp lí nếu có thể)
\(\dfrac{1}{2}+\dfrac{3}{4}-\left(\dfrac{3}{4}-\dfrac{4}{5}\right)\)
\(\dfrac{-3}{7}+\dfrac{3}{4}:\dfrac{3}{14}\)
\(5-\dfrac{7}{39}:\dfrac{7}{13}+\dfrac{8}{9}:4\)
\(1\dfrac{13}{15}.0,75-\left(\dfrac{11}{20}+25\%\right):\dfrac{7}{3}\)
\(\left(\dfrac{5}{12}:\dfrac{11}{6}+\dfrac{5}{12}:\dfrac{11}{5}\right)--\dfrac{7}{12}\)
làm nhanh cho mình nha!!!!Thank nhìu
Bài 1 : Tính
a) A=\(\dfrac{\dfrac{1}{9}-\dfrac{1}{7}-\dfrac{1}{11}}{\dfrac{4}{9}-\dfrac{4}{7}-\dfrac{4}{11}}\)\(+\dfrac{0,6-\dfrac{3}{25}-\dfrac{3}{125}-\dfrac{3}{625}}{\dfrac{4}{5}-0,16-\dfrac{4}{125}-\dfrac{4}{625}}\)
b)B=\(\dfrac{8}{9}-\dfrac{1}{72}-\dfrac{1}{56}-\dfrac{1}{42}-...-\dfrac{1}{6}-\dfrac{1}{2}\)
c)C=\(\dfrac{1}{1.3}-\dfrac{1}{2.4}+\dfrac{1}{3.5}-\dfrac{1}{4.6}+\dfrac{1}{5.7}-\dfrac{1}{6.8}+\dfrac{1}{7.9}-\dfrac{1}{8.10}\)
1 tiếng nữa mình cần rồi giúp mình nhé !!!!!!!!!! Vạn lời tri ân
tìm các số nguyên x, y biết
a, \(\dfrac{24}{7x-3}\)=\(\dfrac{-4}{25}\)
b, \(\dfrac{4}{x-6}\)=\(\dfrac{y}{24}\)=\(\dfrac{-12}{18}\)
c, \(\dfrac{-1}{5}\)<\(\dfrac{x}{8}\)<\(\dfrac{1}{4}\)
d, \(\dfrac{x+46}{20}\)=x\(\dfrac{2}{5}\)
f, y\(\dfrac{5}{y}\)=\(\dfrac{86}{y}\)
bài1
a,x-25%x=0.5
b,(50%x+\(5\dfrac{1}{4}\)).\(\dfrac{-2}{3}\)=\(2\dfrac{5}{6}\)
c,(\(1\dfrac{1}{3}\) -25%-\(\dfrac{5}{12}\) )+2x=1.5:\(\dfrac{3}{5}\)