-8 15
____ _ _____
18 27
K
Khách
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Những câu hỏi liên quan
7 tháng 6 2016
1. She went out the room without saying a word.
2. The life in the countryside is changing___for _ better.
3. She was born___at__2 o’clock ___on__18th July.
4. Mary is thinking_of____ importing flowers__in___China.
5. They are traveling_to____ the airport___by__ a bus.
6. I am afraid___of_ghost.
7. Lan’s family came to this city__in__1985.
8. He had a lot of troubles with English when the beginning.
9. The doctor looks after sick people.
10. It is about 30 kms from Ha Noi __to__my house.
7 tháng 6 2016
1. She went out the room without saying a word.
2. The life in the countryside is changing for better.
3. She was born at 2 o’clock on 18th July.
4. Mary is thinking of importing flowers__in___China.
5. They are traveling_to____ the airport___by__ a bus.
6. I am afraid___of_ghost.
7. Lan’s family came to this city__in__1985.
8. He had a lot of troubles with English when the beginning.
9. The doctor looks after sick people.
10. It is about 30 kms from Ha Noi __to__my house.
7 tháng 1 2022
a. (7-3+1)/8 = 5/8
b. (-5+26-1)/21 = 20/21
c. (-3-8+5)/27 = -6/27= -2/9
15 tháng 8 2023
a: \(\sqrt[3]{-8}\cdot\sqrt[3]{27}=-2\cdot3=-6\)
\(\sqrt[3]{\left(-8\right)\cdot27}=\sqrt[3]{-216}=-6\)
Do đó: \(\sqrt[3]{-8}\cdot\sqrt[3]{27}=\sqrt[3]{\left(-8\right)\cdot27}\)
b: \(\dfrac{\sqrt[3]{-8}}{\sqrt[3]{27}}=-\dfrac{2}{3}\)
\(\sqrt[3]{-\dfrac{8}{27}}=-\dfrac{2}{3}\)
Do đó: \(\dfrac{\sqrt[3]{-8}}{\sqrt[3]{27}}=\sqrt[3]{-\dfrac{8}{27}}\)
HQ
Hà Quang Minh
Giáo viên
2 tháng 10 2023
a) (-8).72 + 8.(-19) - (-8)
= (-8).72 + (-8).19 - (-8).1
= (-8).(72 + 19 - 1)
= (-8).90
= -720
b) (-27).1011 - 27.(-12) + 27.(-1)
= 27.(-1011) - 27.(-12) + 27.(-1)
= 27.(-1011 + 12 - 1)
= 27.(-1 000)
= -27 000
T
10 tháng 9 2023
\(\dfrac{8}{27}-\dfrac{49}{4}+\left(-\dfrac{8}{27}\right)\)
\(=\left[\dfrac{8}{27}+\left(-\dfrac{8}{27}\right)\right]-\dfrac{49}{4}\)
\(=0-\dfrac{49}{4}\)
\(=-\dfrac{49}{4}\)
#Toru
GN
GV Nguyễn Trần Thành Đạt
Giáo viên
10 tháng 9 2023
\(\dfrac{8}{27}-\dfrac{49}{4}+\left(-\dfrac{8}{27}\right)\\ =\left(-\dfrac{8}{27}+\dfrac{8}{27}\right)-\dfrac{49}{4}\\ =0-\dfrac{49}{4}\\ =-\dfrac{49}{4}\)
2 tháng 12 2021
a) (-8).72 + 8.(-19) - (-8).
= (-8).72 + (-8).19 - (-8).
= -8.(72 + 19 - 1).
= (-8).(71 + 19).
= (-8). 90 = -720.
b) (-27).1011 - 27.(-12) + 27. (-1).
= (-27).1011 - (-27).12 + (-27).1.
= (-27).(1011 - 12 + 1).
= (-27).(1012 -12).
= (-27).1000.
= -27000.
31 tháng 12 2021
a) (-8).72 + 8.(-19) - (-8).
= (-8).72 + (-8).19 - (-8).
= -8.(72 + 19 - 1).
= (-8).(71 + 19).
= (-8). 90 = -720.
b) (-27).1011 - 27.(-12) + 27. (-1).
= (-27).1011 - (-27).12 + (-27).1.
= (-27).(1011 - 12 + 1).
= (-27).(1012 -12).
= (-27).1000.
= -27000.
DV
5$-\frac{5}{3}+\frac{5}{9}-\frac{5}{27}$ \(8-\dfrac{8}{3}+\dfrac{8}{9}-\dfrac{8}{27}\) trên nhau nha
1
30 tháng 8 2023
\(A=\dfrac{5-\dfrac{5}{3}+\dfrac{5}{9}-\dfrac{5}{27}}{8-\dfrac{8}{3}+\dfrac{8}{9}-\dfrac{8}{27}}\)
\(\Rightarrow A=\dfrac{5\left(1-\dfrac{1}{3}+\dfrac{1}{9}-\dfrac{1}{27}\right)}{8\left(1-\dfrac{1}{3}+\dfrac{1}{9}-\dfrac{1}{27}\right)}\)
\(\Rightarrow A=\dfrac{5}{8}\)
D
7 tháng 4 2020
\(\frac{12}{27}+\frac{7}{27}+\frac{8}{27}\)
\(=\frac{27}{27}=1\)
Vậy kết quả là 1
Chúc bạn học tốt !
7 tháng 4 2020
\(\frac{12}{27}\)12/27 + 7/27 +8/27 = 1
Đ/S : 1
K cho mk nha
28 tháng 1 2016
\(x-\frac{8}{27}=\frac{7}{27}\)
\(x\in\left(-\infty;\infty\right)\)
\(\frac{27x-8}{27}=\frac{7}{27}\Rightarrow\left(27x-8\right)27=27.7\)
\(\frac{\left(27x-8\right)27}{27}=\frac{27.7}{27}\)
\(27x-8=\frac{27.7}{27}\)
Rút gọn :
\(x=\frac{5}{9}\)
\(-\frac{8}{18}-\frac{15}{27}=-\frac{4}{9}-\frac{5}{9}=-\frac{9}{9}=-1\)