A)(3 1/3+2,5):(3 1/6-4 1/5)-11/31.
b)3/21-12/47+27/53:4/41-16/47+36/53.
dề bài:tính giá trị biểu thức.
1 . Tính nhanh
a/ 15 . ( 27 + 18 + 6 ) + 15 . ( 23 + 12 )
b/ 14 . 35 . 5 + 10 . 25 .7 + 20 . 70
c/ 53 . ( 51 + 4 ) + 53 . ( 49 + 96 ) + 53
d/ 46 . ( 27 + 75 ) + 8 . ( 58 + 25 ) . 2
tính nhanh nếu có thể:
a)\(\dfrac{4}{2.4}+\dfrac{4}{4.6}+\dfrac{4}{6.8}+.....+\dfrac{4}{2008.2010}\)
b)\(\dfrac{\dfrac{3}{41}-\dfrac{12}{47}+\dfrac{27}{53}}{\dfrac{4}{41}-\dfrac{16}{47}+\dfrac{36}{53}}\)
Bài 1: tìm x:
a)\(\frac{2}{3}\).x-\(\frac{3}{2}\).x=\(\frac{5}{12}\)
b) \(\frac{7}{9}\):(2+\(\frac{3}{4}\).x)+\(\frac{5}{9}\)=\(\frac{23}{27}\)
c)\(\frac{2}{5}\)+\(\frac{3}{5}\).(3x-3,7)= -\(\frac{53}{10}\)
\(\dfrac{\dfrac{3}{41}-\dfrac{12}{47}+\dfrac{27}{53}}{\dfrac{4}{41}-\dfrac{16}{47}+\dfrac{36}{53}}+\)
đề bài là \(Tính\)
Thực hiện phép tính :
a) 18 : 32 + 5 . 23
b) ( -12 ) + ( -42 )
c) 53 . 25 + 53 . 75 + 27 . 18 + 33 . 82
d) 75 + ( -350 ) + ( -75 )
Thực hiên phép tính sau :
a) 18 : 32 + 5 . 23
b) ( -12 ) + ( -42 )
c) 53 . 25 + 53 . 75 + 27 . 18 + 33 . 82
d) 75 + ( -350 ) + ( -75 0
Tim x :2/5+3/5×(3x-3,7)=-53/10
Tim x : 2/5+3/5×(3x-3,7)=-53/10