3. So sánh
a) A = 1/2019 - 3/11^2 - 5/11^3 - 7/11^4 và B = -1/2019 - 7/11^2 - 5/11^3 - 3/11^4
b) A = 2006/2007 - 2007/2008 + 2008/2009 - 2009/2010 và B = -1/2006.2007 - 1/2008.2009
Bài 1 : Thực hiện phép tính
a) ( -1/2) - ( -3/5) + ( -1/9) + 1/71 - ( -2/7) + 4/35 - 7/18
b) ( 3 - 1/4 +2/3) - ( 5 - 1/3 - 6/5 ) - (6 - 7/4 +3/2 )
Bài 2 : Thực hiện phép tính
a) 2/3 - 4 . ( 1/2 +3/4 )
b) ( -1/3 +5/6) .11 -7
c) ( -5/9) . 3/11 + ( -13/18) . 3/11
d) ( -2/3) . 3/11 + ( -16/9) . 3/11
CÁC BẠN CỐ GẮNG HỘ MK NHA :(((
AI NHANH NHẤT HỨA TICK <3 <3 <3
TKS M.N TRƯỚC AK =v=
a) -6.(-2/3).0,25
b) -15/4.(-7/15).(-2 2/5)
c) (-2 1/5).(-9/11).(-11/14).2/5
1) Tính:
a) \(\frac{2}{3}-4.\left(\frac{1}{2}+\frac{3}{4}\right)\)
b)\(\left(-\frac{1}{3}+\frac{5}{6}\right).11-7\)
c) \(\frac{3}{11}.\frac{4}{15}+\frac{19}{15}.\frac{-3}{11}\)
1) Thực hiện phép tính:
a) (-3+4):2 b) -4+(-5)-17 c) 4-[(-11)-(2+5)]
5 9 7 9 9 4 3 6 9 3
2) Tìm x biết:
a) 2+7:x=5 b) (-0,75 x +5).4-(-1)=-5 c)-x+5=1,2 d)2+2x=1
3 4 6 2 7 3 6 3 3 2
3) Tìm số nguyên x,y biết:
x-1=1
4 y 2
a)\(\dfrac{\dfrac{2}{3}-}{\dfrac{8}{3}-}\dfrac{\dfrac{2}{5}+}{\dfrac{8}{5}+}\dfrac{\dfrac{2}{7}-}{\dfrac{8}{7}-}\dfrac{\dfrac{2}{9}+}{\dfrac{8}{9}+}\dfrac{\dfrac{2}{11}}{\dfrac{8}{11}}\)
b)\(\left(\dfrac{1}{2}-1\right)\left(\dfrac{1}{3}-1\right)\left(\dfrac{1}{4}-1\right)...\left(\dfrac{1}{50}-1\right)\left(\dfrac{1}{51}-1\right)\)
thực hiện phép tính:
a,\(\left(\dfrac{2}{3}\right)^3-\left(\dfrac{3}{4}\right)^2.\left(-1\right)^5\)
b,\(12:\left(\dfrac{3}{4}-\dfrac{5}{6}\right)^2\)
c,\(\dfrac{7}{22}:\dfrac{3}{11}+\dfrac{7}{22}:\dfrac{4}{11}\)
d,\(\dfrac{12}{35}.\left(\dfrac{7}{4}+\dfrac{13}{4}\right)-\dfrac{1}{3}\)
Giúp mk với
Tính :
a) \(\left(\dfrac{-2}{3}+\dfrac{3}{7}\right):\dfrac{4}{5}+\left(\dfrac{-1}{3}+\dfrac{4}{7}\right):\dfrac{4}{5}\)
b) \(\dfrac{5}{9}:\left(\dfrac{1}{11}-\dfrac{5}{22}\right)+\dfrac{5}{9}:\left(\dfrac{1}{15}-\dfrac{2}{3}\right).\)
a) A= \(\dfrac{1}{3}-\dfrac{3}{4}-\left(-\dfrac{3}{5}\right)+\dfrac{1}{72}-\dfrac{2}{9}-\dfrac{1}{36}+\dfrac{1}{15}\)
b) B=\(\dfrac{1}{5}-\dfrac{3}{7}+\dfrac{5}{9}-\dfrac{2}{9}+\dfrac{7}{13}-\dfrac{2}{11}-\dfrac{5}{9}+\dfrac{3}{7}-\dfrac{1}{5}\)
c) C=\(\dfrac{1}{100}-\dfrac{1}{100.99}-\dfrac{1}{99.98}-\dfrac{1}{98.97}-......-\dfrac{1}{3.2}-\dfrac{1}{2.1}\)