a [ 5/3 -(1/9) : 1 1/5] : (5/8 + 9/4)
b 2dv 3/4 : 2dv 1/6 . (-3/5) +4,5 .4/5
Những câu hỏi liên quan
Bài 1: Tìm x :A) 3/4.(x-2) - 1/2.(6-2.x)= 1/6.x + 5
B) -1/2.(3.x + 5) - 2/3.(9-6.x) = 3/5.(x-10) - 3
C) (1/4.x - 1,5) + (5/6.x - 3) - (5/8.x -0,5) = -4,5
Tính:
a) -5/7(14/5 - 7/10) : |-2/3| - 3/4(8/9 + 16/3) + 10/3(1/3 + 1/5)
b) 17/-26(1/6 - 5/3) : 17/13 - 20/3(2/5 - 1/4) + 2/3(6/5 - 9/2)
c) -8/9(9/8 - 3/2) + 5/4 : (5/2 - 15/4) - 3/4(10/9 - 8/3) : (-1/3)
d) 21/10 : (12/5 - 9/10) . (-4/7) - 3/2(1/6 - 7/12) + 1/5(3/2 - 1/4)
a) Ta có: \(\dfrac{-5}{7}\left(\dfrac{14}{5}-\dfrac{7}{10}\right):\left|-\dfrac{2}{3}\right|-\dfrac{3}{4}\left(\dfrac{8}{9}+\dfrac{16}{3}\right)+\dfrac{10}{3}\left(\dfrac{1}{3}+\dfrac{1}{5}\right)\)
\(=\dfrac{-5}{7}\cdot\dfrac{3}{2}\cdot\dfrac{21}{10}-\dfrac{3}{4}\cdot\dfrac{56}{3}+\dfrac{10}{3}\cdot\dfrac{8}{15}\)
\(=\dfrac{-9}{4}-14+\dfrac{16}{9}\)
\(=\dfrac{-1621}{126}\)
b) Ta có: \(\dfrac{17}{-26}\cdot\left(\dfrac{1}{6}-\dfrac{5}{3}\right):\dfrac{17}{13}-\dfrac{20}{3}\left(\dfrac{2}{5}-\dfrac{1}{4}\right)+\dfrac{2}{3}\left(\dfrac{6}{5}-\dfrac{9}{2}\right)\)
\(=\dfrac{-17}{26}\cdot\dfrac{13}{17}\cdot\dfrac{-3}{2}-\dfrac{20}{3}\cdot\dfrac{3}{20}+\dfrac{2}{3}\cdot\dfrac{-33}{10}\)
\(=\dfrac{3}{4}-1-\dfrac{11}{5}\)
\(=-\dfrac{49}{20}\)
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Tính nhẩm:
a. 1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9= ....?
b. 9-9+8-8+7-6+6-5+1-3+2+4+5+6-3-8=....?
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Bài 1:Tính1) (1/2)^3 (3/2)^2 2) (2/3)^3 (3/2)^5 3) (5/4)^5 (4/5)^7 4) (-5/6)^6 (6/5)^8 5)(-4/3)^3 (9/16)^5 6) (1/3)^4 (-9/2)^6 7)(-4/9)^3 (-27/20)^4 8) (0,2)^4 . 5^6 9) (-4/3)^3 (9/16)^5 10) (-0,2)^3 .(-5)^5 11) (-4)^4 .(0,25)^6 12) $^2 . (0,2)^3 13) (0,5)^2 . 2^4 14) (-0,5)^3 .2^6 15) (-0,5)^5 .(-2)^10 16) (0,125)^2 .8^4 17) (0,125)^5 . (-8)^4...
Đọc tiếp
Bài 1:Tính
1) (1/2)^3 (3/2)^2
2) (2/3)^3 (3/2)^5
3) (5/4)^5 (4/5)^7
4) (-5/6)^6 (6/5)^8
5)(-4/3)^3 (9/16)^5
6) (1/3)^4 (-9/2)^6
7)(-4/9)^3 (-27/20)^4
8) (0,2)^4 . 5^6
9) (-4/3)^3 (9/16)^5
10) (-0,2)^3 .(-5)^5
11) (-4)^4 .(0,25)^6
12) $^2 . (0,2)^3
13) (0,5)^2 . 2^4
14) (-0,5)^3 .2^6
15) (-0,5)^5 .(-2)^10
16) (0,125)^2 .8^4
17) (0,125)^5 . (-8)^4
18) (-0,125)^7 . 8^10
19) (-0,1)^4 . 10^7
20) (0,1)^5 . (-10)^10
Giúp mình với ạ,mình cảm ơn ạ
1: =1/8*9/4=9/32
2: =8/27*243/32=9/4
3: =(5/4*4/5)^5*(4/5)^2=16/25
4: \(=\left(-\dfrac{5}{6}\cdot\dfrac{6}{5}\right)^2\cdot\left(\dfrac{6}{5}\right)^2=\dfrac{36}{25}\)
5: \(=\left(-\dfrac{4}{3}\right)^3\cdot\left(\dfrac{3}{4}\right)^{10}=\left(-1\right)\left(\dfrac{3}{4}\right)^7=-\left(\dfrac{3}{4}\right)^7\)
6: \(=\left(\dfrac{1}{3}\cdot\dfrac{-9}{2}\right)^4\left(-\dfrac{9}{2}\right)^2=\left(-\dfrac{3}{2}\right)^4\cdot\dfrac{81}{4}=\dfrac{9}{4}\cdot\dfrac{81}{4}=\dfrac{729}{16}\)
8: =(0,2*5)^4*5^2=25
10: =-0,5^5*2^10
=-0,5^5*2^5*2^5
=-32
13: =(0,5*2)^2*2^2=4
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A = 1+ 5+ 5^2 + 5^3 + 5^4 + 5^5 + 5^6 + 5^7 + 5^8 + 5^9
1 + 5 + 5^2 + 5^3 + 5^4 + 5^5 + 5^6 + 5^7 + 5^8
B = 1 + 3 + 3^2 + 3^3 + 3^4 + 3^5 + 3^6 + 3^7 + 3^8 + 3^9
1 + 3 + 3^2 + 3^3 + 3^4 + 3^5+ 3^6 +3^7 + 3^8
So sánh A; B
[1] Cho hai tập hợp A = { 1; 3; 5; 7; 9 }; B = { 0;1; 2; 4; 5; 6; 8 }. Tìm tập hợp C = A \(\cup B\)
A. C = { 3; 7; 9 } B. C = { 1; 5 } C. C = { 1; 3; 5; 7; 9 } D. D = { 0; 1; 2; 3; 4; 5; 6; 7; 8; 9 }
Ta có:
Tập hợp A:
\(A=\left\{1;3;5;7;9\right\}\)
Tập hợp B:
\(B=\left\{0;1;2;4;5;6;8\right\}\)
Mà: \(C=A\cup B\)
\(\Rightarrow C=\left\{0;1;2;3;4;5;6;7;8;9\right\}\)
⇒ Chọn D
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C = A ∪ B = {0; 1; 2; 3; 4; 5; 6; 7; 8; 9}
Chọn D
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8 tháng 5 2022 lúc 7:45
1+1+1+1+2+2+2+3+3+3+3+4+4+4+4+5+5+5+5+6+6+6+6+7+7+7+7+8+8+8+8+9+9+9+9+10=
= (1+1+1+1)+(2+2+2)+(3+3+3+3)+(4+4+4+4)+(5+5+5+5)+(6+6+6+6)+(7+7+7+7)+(8+8+8+8)+(9+9+9+9)+10
4 + 6 + 12 + 16 + 20 + 24 + 28 + 32 + 36 + 10 =
= 188
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a. 1/5 x 1/2 : 3/10 =
b. 2/3 : 6/5 : 2/9 =
c. 6/4 : 1/4 - 8/5 =
d. 0 : 4/5 x 6/9 =
a. 1/5 x 1/2 : 3/10 = 1/5 x 1/2 x 10/3 = 1/3
b. 2/3 : 6/5 : 2/9 = 2/3 x 5/6 x 9/2 = 5/2
c. 6/4 : 1/4 - 8/5 = 6/4 x 4 - 8/5 = 6 - 8/5 = 22/5
d. 0 : 4/5 x 6/9 =0 x 6/9 = 0
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a,1/5 x 1/2 : 3/10
= 1/10 : 3/10
= 1/3
b,2/3 : 6/5 : 2/9
= 5/9 : 2/9
= 5/2
c. 6/4 : 1/4 - 8/5
= 6 - 8/5
= 22/5
d. 0 : 4/5 x 6/9
= 0 x 6/9
= 0
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