a) A= 32 . 1/243 . 812 .1/33
b) B= (4.25 ):(23 .1/6)
c) C= (-1/3)3 .(-1/3)2 .(-1/3)
d) D= (-1/3)-1 -(-6/7)0 +(1/2)2 :2
Bài 1 Tính nhanh
a) -3/7 + 5/13 + 3/7
b) -5/21+-2/21+8/24
c) -5/11+(-6/11+2)
d) (-1/32+1/2)+15/32
e)5/17+ -6/13 + 3/4 + 7/-13+12/17
f) 7/23+-18/18+-4/9+16/23+-5/8
g)1/3+-3/4+3/5+-1/36+1/15+-2/9
h)-1/2+1/3+-1/4+-2/8+4/18+4/9
a)\(-\dfrac{3}{7}+\dfrac{5}{13}+\dfrac{3}{7}\)
=\(\left(-\dfrac{3}{7}+\dfrac{3}{7}\right)+\dfrac{5}{13}\)
=\(0+\dfrac{5}{13}\)
=\(\dfrac{5}{13}\)
Bài 4 : Tính giá trị các biểu thức :
a. A= 22 - (-32)3 + 4-2 .16-2.52 .
b. B= (23 : 1/2) . 1/2+3-2.9-7. (14/25)0+5 .
c. C= 2-3 + (52)3.5-3+4-3 . 16 -2.32-105. (24/51)0 .
d. D= (2-3.1/2-2).2/3+4-2.8-7.(17/23)0+19 .
A=\(2^2-9^3+4^{-2}.16-2.5^2\)
\(=4-729+1-50=-774\)
B=\(\left(2^3.2\right).\dfrac{1}{2}+3^{-2}.3^2-7.1+5\)
\(B=2^4.\dfrac{1}{2}+1-7+5=8+1-7+5=7\)
Thực hiện phép tính
1, A, 2³.10-2³.5. B, 5.3²-42. C, 6+3.2² D, 2³.3-21
2, a, 7⁶÷7⁴+3³.3²-1²⁰²² B, 6⁶÷6⁵+2³.2²-²⁰²²⁰ C, 2³.2²+6⁶÷6⁵+23¹
D, 3³.3²+7⁷÷7⁵-2³ giúp mình với vì tối nay mình đi học rồi
1. a) 40
b) 3
c) 18
d) 3
2. a) 291
b) 37
c) 61
d) 284
BÀI TÍNH NHANH
A.2/3+2/6+2/12+2/24+2/48+2/96+2/192
B.1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
C.1/3+1/9+1/27+1/81+1/243+1/729
D.3/2+3/8+3/32+3/128+3/512
E.3+3/5+3/25+3/125+3/625
a) = \(\frac{127}{96}\)
b) = \(\frac{255}{256}\)
c) Mik bỏ nha
d) = \(\frac{1023}{512}\)
e) = \(\frac{2343}{625}\)
a)(5+1/5-2/9)-(2-1/23-3/35+5/6)-(8+2/7-1/18)
b) 1/3-3/4(-3/5+1/64- -2/9-1/36+1/15
c) -5/7-(-5/67)+13/10+1/2+(-1/6)+1 3/14-(-2/5)
d)3/5:(-1/15-1/6)+3/5:(-1/3-1 1/15)
Bài 6. Tính
a) A=1+3+32+33+...+32000
b) B = 250- 249- 248 -...- 22- 2
c) C = 2000.(20019+20018+...+2001)+1
d) D = 1-2+22-23+...+22020
a, A = 1 + 3 + 32 + 33 + ... + 32000
3.A = 3 + 32 + 33+ 33+... + 32001
3A - A = 3 + 32 + 33 + ... + 32001 - (1 + 3 + 32 + 33 + ... + 32000)
2A = 3 + 32 + 33 + ... + 32001 - 1 - 3 - 32 - 33 - ... - 32000
2A = 32001 - 1
A = \(\dfrac{3^{2001}-1}{2}\)
[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
C = A ∪ B = {0; 1; 2; 3; 4; 5; 6; 7; 8; 9}
Chọn D
Bài 1: Thực hiện phép tính
a, (-1/2)^4 - |-2/3| + 2016^0
b, (2/3 - 5/7) (2/7 + 5/21 -1)
c, 6^3 . 27/2^4 . 3^6
Bài 2: chứng minh rằng
A= 3/1^2. 2^2 + 5/2^2 . 3^2 + 7/3^2 . 4^2 + ... + 19/9^2 . 10^2 < 1
Bài 3: tìm x biết
a, -1/2x - 3/5 = -4/5
b, 1-5x/2 = 7x+ 3/9
c, (2x-1)^5 = 243
d, (x+1)^2016 = 1
Bài 1: Thực hiện phép tính
a, (-1/2)^4 - |-2/3| + 2016^0=1/16-2/3+1
=19/48
b, (2/3 - 5/7) (2/7 + 5/21 -1)=-1/21.-10/21
=-11/21
Tính a)16/13-(3/15-6/13)
b)21/8-(1/2+3/5)
c)3/2x9/5-3-2x2/7
d)32/45x18/16
e)(4/3-4/5)x25/2
f)2-1/3-1/2-1/6-3/12
a)\(=\dfrac{16}{13}-\dfrac{3}{15}+\dfrac{6}{13}=\dfrac{22}{13}-\dfrac{3}{15}=\dfrac{96}{65}\)
b)\(=\dfrac{21}{8}-\left(\dfrac{5}{10}+\dfrac{6}{10}\right)=\dfrac{21}{8}-\dfrac{11}{10}=\dfrac{61}{40}\)
c)\(=\dfrac{27}{10}-3-\dfrac{4}{7}--\dfrac{61}{70}\)
d)\(=\dfrac{576}{702}=\dfrac{4}{5}\)
e)\(=\left(\dfrac{20}{15}-\dfrac{12}{15}\right)\times\dfrac{25}{2}=\dfrac{8}{15}\times\dfrac{25}{2}=\dfrac{20}{3}\)
f)\(=\dfrac{24}{12}-\dfrac{4}{12}-\dfrac{6}{12}-\dfrac{2}{12}-\dfrac{3}{12}=\dfrac{9}{12}=\dfrac{3}{4}\)
d) \(=\dfrac{32}{45}x\dfrac{18}{16}=\dfrac{576}{720}=\dfrac{115}{114}\)
e) \(=\left(\dfrac{4}{3}-\dfrac{4}{5}\right)x\dfrac{25}{12}=\dfrac{8}{15}x\dfrac{25}{12}=\dfrac{200}{180}=\dfrac{10}{9}\)
f) \(=\dfrac{2}{1}-\dfrac{1}{3}-\dfrac{1}{2}-\dfrac{1}{6}-\dfrac{3}{12}=\dfrac{24}{12}-\dfrac{4}{12}-\dfrac{6}{12}-\dfrac{2}{12}-\dfrac{3}{12}\)
\(=\dfrac{20}{12}-\dfrac{4}{12}-\dfrac{3}{12}=\dfrac{16}{12}-\dfrac{3}{12}=\dfrac{13}{12}\)