15/ 24 - 2/ 15
Những câu hỏi liên quan
tính 17/8+28/15-8/15=?
a)3 11/24
b)5 11/15
c)2 11/24
d)2 11/15
\(\frac{17}{8}+\frac{28}{15}-\frac{8}{15}=\frac{17}{8}+\frac{4}{3}=\frac{83}{24}=3\frac{11}{24}\)
=> chọn a
35 + (–47) – |–12|
(–15) – 70 : (–14) + (–32) . (–2)
15 – 12 . (–3)2 – 135 : |–15|
Tính hợp lý: –24 . 78 + 24(–35) – 24(–13)
\(\text{35 + (–47) – |–12|}\)
\(=-12-12\)
\(=-24\)
\(\text{(–15) – 70 : (–14) + (–32) . (–2)}\)
\(=-15+5+64\)
\(=-10+64\)
\(=54\)
\(\text{ 15 – 12 . (-3)^2 – 135 : |–15|}\)
\(=15-12.9-135:15\)
\(=15-108-9\)
\(=-102\)
Tính hợp lý:
\(\text{ –24 . 78 + 24(–35) – 24(–13)}\)
\(=24.\left(-78+\left(-35\right)-\left(-13\right)\right)\)
\(=24.\left(-100\right)\)
\(=-2400\)
học tốt
Tính nhanh:
1/9×10 + 2/10×12 + 3/12×15 + 4/15×19 + 5/15×24 + 6/24 ×30
\(\frac{1}{9\cdot10}+\frac{2}{10\cdot12}+\frac{3}{12\cdot15}+\frac{4}{15\cdot19}+\frac{5}{19\cdot24}+\frac{6}{24\cdot30}
\)
\(=\frac{1}{9}-\frac{1}{10}+\frac{1}{10}-\frac{1}{12}+\frac{1}{12}-\frac{1}{15}+\frac{1}{15}-\frac{1}{19}+\frac{1}{19}-\frac{1}{24}+\frac{1}{24}-\frac{1}{30}\)
\(=\frac{1}{9}-\frac{1}{30}\)
\(=\frac{10}{90}-\frac{3}{90}\)
\(=\frac{7}{90}\)
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(-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
A. 61+24+15
B. 61+24-15
C. 61-24+15
D. 61-24-15
Trl
A . = 100
B = 70
C = 52
D = 22
_Hc tốt
TL:
A=100
B=70
C=52
D=22
tra loi
a.100
b. 70
c.52
d.22
Xem thêm câu trả lời
3. b) 1dfrac{13}{15}.(0,5)2.3+(dfrac{8}{15}-1dfrac{19}{60}):1dfrac{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
Đọc tiếp
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 - 2/4/15) : 1/23/24
\(=\dfrac{-16}{5}\cdot\dfrac{-15}{64}+\left(\dfrac{4}{5}-2-\dfrac{4}{15}\right):\dfrac{47}{24}\)
\(=\dfrac{3}{4}-\dfrac{22}{15}\cdot\dfrac{24}{47}=\dfrac{1}{940}\)
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Bài 15: Tìm
1) Ư(10) và B(10)
2) Ư(+15) và B(+15)
3) Ư(-24) và B(-24)
4) ƯC(12; 18)
5) ƯC(-15; +20)
GIẢI DC MÌNH TICK CHO
1. Ư(10)={1;-1;2;-2;5;-5;10;-10
B(10)={0;10;-10;20;-20;30;-30;...}
2. Ư(+15)={1;-1;3;-3;5;-5;15;-15}
B(+15)={0;15;-15;30;-30;45;-45;...}
3. Ư(-24)={1;-1;2;-2;3;-3;4;-4;6;-6;8;-8;12;-12;24;-24}
B(-24)={0;24;-24;48;-48;72;-72;...}
4. ƯC(12;18)={1;-1;2;-2;3;-3;6;-6}
5. ƯC(-15;+20)={1;-1;5;-5}
bài 2
1)-5/8*15/4
2) -15/17*25/-34
3) -12*8/3
4)-15/14*20/-21
5)-48*(-24/5)
1: \(=\dfrac{-5}{8}\cdot\dfrac{15}{4}=-\dfrac{75}{32}\)
2: \(=\dfrac{15}{17}\cdot\dfrac{25}{34}=\dfrac{375}{578}\)
3: \(=-12\cdot\dfrac{8}{3}=-4\cdot8=-32\)
4: \(=\dfrac{15}{14}\cdot\dfrac{20}{21}=\dfrac{50}{49}\)
5: \(=48\cdot\dfrac{24}{5}=230.4\)
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