giúp mk nhanh nha
72-16+8-32
Tính nhanh :
1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/67 + 1/28
Các bạn giúp mk nha!
Ai nhanh mk ib kb
1/2 + 1/4 + 1/8 +1/16 + 1/32 + 1/64 + 1/128
= 2 . ( 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 )
= 1 + 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 - 1/128 + 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 ( Rồi giản ước )
= 1
tính nhanh 1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512
AI GIÚP MÌNH SẼ CHO MỘT MK
#)Giải :
\(\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}+\frac{1}{256}+\frac{1}{512}\)
\(=\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+\frac{1}{8}-\frac{1}{16}+...+\frac{1}{256}-\frac{1}{512}\)
\(=\frac{1}{2}-\frac{1}{512}\)
\(=\frac{255}{512}\)
Lời giải
\(=\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+\frac{1}{8}-\frac{1}{16}+...+\frac{1}{256}-\frac{1}{512}\)
\(=\frac{1}{2}-\frac{1}{512}\)
\(=\frac{255}{512}\)
( 190 - 2 x X ) :35 + 32 = 16
các bn giúp mk nhanh nha mk cần gấp
\(\left(190-2.x\right):35+32=16\)
\(=>\left(190-2x\right):35=-16\)
\(=>190-2x=-560\)
\(=>2x=750\)
\(=>x=375\)
Ủng hộ nha các bạn
(190 - 2 x X):35+32 = 16
(190 - 2 x X): 35 = 16 -32 = -16
(190 - 2 x X = (-16) x 35 = -560
2 x X = 190 - (-560)
2 x X = 190 + 560 = 750
X = 750 : 2 = 350
( 190 - 2 x X ) : 35 + 32 = 16
mk cần gấp giúp mk nhanh nha
ai làm đc mk sẽ tích
(190 - 2 x X) : 35 + 32 = 16
(190 - 2x) : 35 = 16 - 32
(190 - 2x) : 35 = -16
190 - 2x = -16 x 35
190 - 2x = -560
-2x = -560 - 190
-2x = -750
\(x=\frac{-750}{-2}=375\)
tính 1+2+4+8+16+32+...+1024
giúp mk nha
Đặt A = 1 + 2 + 4 + 8 + ..... + 1024
=> 2A = 2 + 4 + 8 + ..... + 2048
=> 2A - A = 2048 - 1
=> A = 2047
Đặt A = 1 + 2 + 4 + 8 + ... + 1024
=> 2A = 2 + 4 + 8 + ... + 2048
=> 2A - A = 2048 - 1
=> 2A = 2047
Đặt A =1+2+4+8+16+32+.....+1024
2A=2x(1+2+4+8+16+32+............+1024)
2A=2+4+8+......+2048
2A-A=(2+4+8+............+2048)-(1+2+4+............+1024)
A=2048 - 1
A=2047
a)1 /2+ 1/4+1/8+1/16+1/32+...+1/256 giúp mk vs mk cần gấp nha😉
đặt \(A=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+...+\frac{1}{256}\)
=> A=\(\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+\frac{1}{2^4}+\frac{1}{2^5}+....+\frac{1}{2^8}\)
=> 2A=\(1+\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+\frac{1}{2^4}+....+\frac{1}{2^7}\)
=> 2A-A=\(\left(1+\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+....+\frac{1}{2^7}\right)-\left(\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+....+\frac{1}{2^8}\right)\)
=> A=\(1-\frac{1}{2^8}\)
( 1+2+3+4+....+1000 ) x ( 16 x 32 - 64 x 8 )
giúp mk vs ( lâu ko hc , chắc mk quên )
(1+2+3+4+....+1000)x(512-512)
=(1+2+3+4+....+1000)X0=0
thanks bn nha mờ chỉ viết vậy thui àk Nguyễn Tiến Dũng
tính nhanh p/s 1+ 5/4 + 5/8 + 5/16 + 5/32 + 5/64
b) 1/3 +1/9 + 1/27 + 1/81 +...........+ 1/59049
c) 3/2 + 3/8 + 3/32 +3/128 + 3/512
d) 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256 giúp mình với
b: A=1/3+1/9+...+1/3^10
=>3A=1+1/3+...+1/3^9
=>A*2=1-1/3^10=(3^10-1)/3^10
=>A=(3^10-1)/(2*3^10)
c: C=3/2+3/8+3/32+3/128+3/512
=>4C=6+3/2+...+3/128
=>3C=6-3/512
=>C=1023/512
d: A=1/2+...+1/256
=>2A=1+1/2+...+1/128
=>A=1-1/256=255/256
Tính nhanh
a) 524.[23+(-45)] +524.(-45+123)
b) 16.(38-32)-38.(16-1)
c) 125.(-8).(-25).9.4.100^0.3
Làm ơn trả lời nhanh hộ mk vs ah
a)524.[23+(-45)] + 524.(-45+123)
=524.(-22) + 524.78
=524.(-22+78)
=524.100
=52400