15/24 + 2/1 =
3. b) \(1\dfrac{13}{15}\).(0,5)2.3+(\(\dfrac{8}{15}\)-\(1\dfrac{19}{60}\)):\(1\dfrac{23}{24}\)
c) (-2)3.\(\dfrac{-1}{24}\)+(\(\dfrac{4}{5}\)-1,2):\(\dfrac{2}{15}\)
d) (\(\dfrac{-2}{5}\))2+\(\dfrac{1}{2}\).(4,5-2)-255
(-3,2).-15/64 + (0,8-2 và 4/15 ):1 và 23/24
1 và 13/15 .3.(0,5) mũ 2.3+(8/15-1 và 19/60):1 và 23/24
Tính nhanh:
1/9×10 + 2/10×12 + 3/12×15 + 4/15×19 + 5/15×24 + 6/24 ×30
\(\frac{1}{9\cdot10}+\frac{2}{10\cdot12}+\frac{3}{12\cdot15}+\frac{4}{15\cdot19}+\frac{5}{19\cdot24}+\frac{6}{24\cdot30}
\)
\(=\frac{1}{9}-\frac{1}{10}+\frac{1}{10}-\frac{1}{12}+\frac{1}{12}-\frac{1}{15}+\frac{1}{15}-\frac{1}{19}+\frac{1}{19}-\frac{1}{24}+\frac{1}{24}-\frac{1}{30}\)
\(=\frac{1}{9}-\frac{1}{30}\)
\(=\frac{10}{90}-\frac{3}{90}\)
\(=\frac{7}{90}\)
(-3,2) . -15/64 + (0,8 - 2/4/15) : 1/23/24
\(=\dfrac{-16}{5}\cdot\dfrac{-15}{64}+\left(\dfrac{4}{5}-2-\dfrac{4}{15}\right):\dfrac{47}{24}\)
\(=\dfrac{3}{4}-\dfrac{22}{15}\cdot\dfrac{24}{47}=\dfrac{1}{940}\)
1) Ư(-24) và B(-24)
2) ƯC(-15; +20)
Ư(-24) = {-24,-12,-8,-6,-4,-3,-2,-1,1,2,3,4,6,8,12,24}
B(-24) = {0.+-24,+-48,...}
ƯC(-15,20) = {1,5,-1,-5}
tìm x biết 1+1/30:(24+1/6-24+1/5)-(1+1/2-3/4)/(4x-1/2)=(-1+1/15):(8+1/5-8+1/3)
tìm x biết 1+1/30:(24+1/6-24+1/5)-(1+1/2-3/4)/(4x-1/2)=(-1+1/15):(8+1/5-8+1/3)
tính
a)1/1/24*5*2/5*2
b)2/3/13*26/58*4*2/15/24*8/21
Bài 1: Sắp xếp các phân số sau theo thứ tự tăng dần
a, -15/24; 36/24; -2/24; -7/24; 0; -1; -97/24
\(\dfrac{-97}{24};-1;\dfrac{-15}{24};\dfrac{-7}{24};\dfrac{-2}{24};0;\dfrac{36}{24}\)