4^5x9^4-2x6^10/2^10 x3^8- 6^9x20
Rút gọn biểu thức
4^5x9^4-2x6^10/2^10x3^8-6^9x20
tính biểu thức:
\(\frac{4^5x9^4-2x6^9}{2^{10}x3^8+6^8x20}\)
a) rút gọn: \(\dfrac{4^5x9^4-2x6^9}{2^{10}x3^8+6^8x20}\)
b) Cho A=\(\dfrac{1}{2}+\dfrac{2}{2^2}+\dfrac{3}{2^3}+\dfrac{4}{2^4}+\dfrac{5}{2^5}+...\dfrac{99}{2^{99}}+\dfrac{100}{2^{100}}\).So sánh A với 2
a: \(\dfrac{4^5\cdot9^4-2\cdot6^9}{2^{10}\cdot3^8+6^8\cdot20}\)
\(=\dfrac{2^{10}\cdot3^8-2\cdot2^9\cdot3^9}{2^{10}\cdot3^8+2^8\cdot3^8\cdot2^2\cdot5}\)
\(=\dfrac{2^{10}\cdot3^8-2^{10}\cdot3^9}{2^{10}\cdot3^8+2^{10}\cdot3^8\cdot5}\)
\(=\dfrac{2^{10}\cdot3^8\left(1-3\right)}{2^{10}\cdot3^8\left(1+5\right)}=\dfrac{-2}{6}=-\dfrac{1}{3}\)
4^5x9^4 - 2x6^9 / 2^10x3^8+6^8x20
Rút gọn : A=4^5x9^4-2x6^9/ 2^10x 3^8 + 6^8 x 20
Tính
A=\(\dfrac{4^5x9^4-2x6^9}{2^{10}x3^8+6^8x20}\)
\(\dfrac{1}{1x2x3}+\dfrac{1}{2x3x4}+...+\dfrac{1}{2015x1016x1017}\)
CHÚ Ý: \(x\) là dấu nhân nhé.Sáng mai mk phải nộp rồi.Mong các bạn giúp mk nha!Mơn nhiều
giúp mình gấp với
RÚT GỌN:
\(\frac{\text{4^5x9^4+2x6^9}}{\text{ }\text{2^10x3^8+6^8x20}}\)
=\(\frac{2^{10}.3^8+12.6^8}{2^{10}.3^8+20.6^8}=\frac{2^{10}.3^8+12.2^8.3^8}{2^{10}.3^8+20.2^8.3^8}\)
\(=\frac{2^8.3^8\left(2^2+12\right)}{2^8.3^8\left(2^2+20\right)}=\frac{16}{24}=\frac{2}{3}\)
các bn mau giúp mk với mk cg co bi gig bài nj
1+2+3+4+5+6+7+8+9+10=A
5x9+5=B
(A+B):3 du ?
Ta có:A=1+2+3+4+5+6+7+8+9+10 =55
B=5x9+5=50
=>(A+B):3=(55+50):3
=105:3
=35
=>Dư 0
ta có: A = 1 + 2+3+4+5+6+7+8+9+10
A= ( 1+10) x 10 : 2
A = 55
B = 5 x 9 + 5 = 50
=> ( A+B) :3 = ( 55 +50) : 3 = 105 : 3 = 35 dư 0
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = A = 45
5 x 9 + 5 = B = 50
(A + B) : 3
(45 + 50) : 3 = 31 dư 2
1.Tính:
a.135 : 5 + 12 x3 : 6 - 17
b.34 :[(80 :4 + 10) : 6 + 12 ] +100
2.tính nhanh:
A= 4+ 8+12 +.....+80
B= 2+4-6+8+10-12+...+62+62-66
1.
A.16
B.102
2.
SSH=( 80-4):4+1=20
TỔNG A= (80+4)*20:2=840