1-1+2+9+8.8/1.x-36.12+5=3615
2/25=.../25 .../36=3/4
3/...=9/36
15/27=5/....
....28=5/7
36/72=..../2
2/25=.2../25 .27../36=3/4
3/.12..=9/36
15/27=5/..9..
..20..28=5/7
36/72=..1../2
\(\dfrac{2}{25}=\dfrac{2}{25}\)
\(\dfrac{27}{36}=\dfrac{3}{4}\)
\(\dfrac{3}{12}=\dfrac{9}{36}\)
\(\dfrac{15}{27}=\dfrac{5}{9}\)
\(\dfrac{20}{28}=\dfrac{5}{7}\)
\(\dfrac{36}{72}=\dfrac{1}{2}\)
TK
2/25=.2../25
27../36=3/4
3/.12..=9/36
15/27=5/..9..
..20..28=5/7
36/72=..1../2
Tìm thuan tiện
a) 36.12+12.14+50.88
Tìm x
b) 4^x+1=64
c) (x+1)^3=125
1.Tính thuận tiện
a) 36.12 + 12.14 + 50.88
= 12.(36 + 14) + 50.88
= 12.50 + 50.88
= 50.(88 + 12)
= 50.100
= 5000
2.Tìm x :
a) 4x + 1 = 64
=> 4x + 1 = 43
=> x + 1 = 3
=> x = 3 - 1
=> x = 2
Vậy x = 2
b) (x + 1)3 = 125
=> (x + 1)3 = 53
=> x + 1 = 5
=> x = 5 - 1
=> x = 4
Vậy x = 4
Thương 1230/3615 bằng:
(A) 415 ; (B) (1/3)15;
(C) (1/3)2; (D) 1.
Hãy chọn đáp án đúng.
Viết gọn các biểu thức sau dưới dạng tích các lũy thừa
A) \(4^8.8^4\)
B) \(4^{15}.5^{15}\)
C) \(2^{10}.15+2^{10}.85\)
D) \(3^3.9^2\)
E) \(5^{12}.7-5^{11}.10\)
F) \(x^1.x^2.x^3...x^{100}\)
GIÚP MÌNH NHA!
a, 48.84
= (22)8.(23)4
= 216.212
= 228
b, 415.515
= (4.5)15
= 2015
c, 210.15 + 210.85
= 210.(15 + 85)
= 210.100
=210.(2.5)2
= 212.52
d, 33.92
= 33 . (32)2
= 33.34
= 37
e, 512.7 - 511.10
= 511.(5.7 - 10)
= 511.25
=511.52
=513
f, \(x^1\).\(x^2\).\(x^3\)....\(x^{100}\)
= \(x^{1+2+3+...+100}\)
= \(x^{\left(1+100\right).100:2}\)
= \(x^{5050}\)
❤Em cảm ơn cô Nguyễn Thương hoài rất nhiều a!❤
a, 48.84
= (22)8.(23)4
= 216.212
= 228
b, 415.515
= (4.5)15
= 2015
c, 210.15 + 210.85
= 210.(15 + 85)
= 210.100
=210.(2.5)2
= 212.52
d, 33.92
= 33 . (32)2
= 33.34
= 37
e, 512.7 - 511.10
= 511.(5.7 - 10)
= 511.25
=511.52
=513
f, ......
=
=
=
A=1/ 6.10+1/ 7.9+1/ 8.8+1/ 9.7+1/ 10.6
Chứng minh rằng: A=1/8. (1/6+1/7+1/8+1/9+1/10)
Cho A = 1/6.10 + 1/7.9 + 1/8.8 + 1/9.7 + 1/10.6
Chứng minh rằng: A = 1/8 ( 1/6 + 1/7 + 1/8 + 1/9 + 1/10 )
Ta có : $16A=\dfrac{16}{6.10}+\dfrac{16}{7.9}+\dfrac{16}{8.8}+\dfrac{16}{9.7}+\dfrac{16}{10.6}$
$=>16A=\dfrac{1}{6}+\dfrac{1}{10}+\dfrac{1}{7}+\dfrac{1}{9}+\dfrac{1}{8}+\dfrac{1}{8}+\dfrac{1}{9}+\dfrac{1}{7}+\dfrac{1}{10}+\dfrac{1}{6}$
$=>16A=2.(\dfrac{1}{6}+\dfrac{1}{7}+\dfrac{1}{8}+\dfrac{1}{9}+\dfrac{1}{10})$
$=>A=\dfrac{1}{8}(dfrac{1}{6}+\dfrac{1}{7}+\dfrac{1}{8}+\dfrac{1}{9}+\dfrac{1}{10})$
\(A=\dfrac{1}{6.10}+\dfrac{1}{7.9}+\dfrac{1}{8.8}+\dfrac{1}{9.7}+\dfrac{1}{10.6}\)
\(16A=\dfrac{16}{6.10}+\dfrac{16}{7.9}+\dfrac{16}{8.8}+\dfrac{16}{9.7}+\dfrac{16}{10.6}\)
\(16A=\dfrac{1}{6}+\dfrac{1}{10}+\dfrac{1}{7}+\dfrac{1}{9}+\dfrac{1}{8}+\dfrac{1}{8}+\dfrac{1}{9}+\dfrac{1}{7}+\dfrac{1}{10}+\dfrac{1}{6}\)
\(16A=2\left(\dfrac{1}{6}+\dfrac{1}{7}+\dfrac{1}{8}+\dfrac{1}{9}+\dfrac{1}{10}\right)\)
\(A=2:16\left(\dfrac{1}{6}+\dfrac{1}{7}+\dfrac{1}{8}+\dfrac{1}{9}+\dfrac{1}{10}\right)\)
\(A=\dfrac{1}{8}\left(\dfrac{1}{6}+\dfrac{1}{7}+\dfrac{1}{8}+\dfrac{1}{9}+\dfrac{1}{10}\right)\left(đpcm\right)\)
A=1/ 6.10+1/ 7.9+1/ 8.8+1/ 9.7+1/ 10.6
Chứng minh rằng: A=1/8. (1/6+1/7+1/8+1/9+1/10)
nhân các phân số
a) -1/5.1/2
b)-1/8.8/-9
c)-3/7.14/15
e)(-4).7/24
f)-9/13.5/18
a )
\(\frac{-1}{5}.\frac{1}{2}=\frac{\left(-1.1\right)}{5.2}=\frac{-1}{10}\)
b )
\(\frac{-1}{8}.\frac{8}{9}=\frac{-1.1}{1.9}=\frac{-1}{9}\)
c )
\(\frac{-3}{7}.\frac{14}{15}=\frac{-1.2}{1.3}=\frac{-2}{3}\)
e )
\(\left(-4\right).\frac{7}{24}=\frac{-28}{24}=\frac{-7}{6}\)
f )
\(\frac{-9}{13}.\frac{-5}{18}=\frac{\left(-1\right).\left(-5\right)}{13.2}=\frac{6}{26}=\frac{3}{13}\)
đúng đó , tk mk nhé ! hihiii
a,\(\frac{-1}{10}\) b,\(\frac{-1}{9}\) c,\(\frac{-2}{5}\) e,\(\frac{-7}{6}\) f,\(\frac{-5}{26}\)
bài 1:thực hiện phép tính
a)4^8.8^15
b)4^15.5^30
c)27^16:9^10
d)
A) 410 . 815 = (22)10 . (23)15 = 220 . 245 = 220+45=265
B) 415 . 530 = (22)15 . 530 = 230 . 530 = (2 . 5)30 = 1030
C) 2716 : 910 = (33)16 : (32)10 = 348 : 320 = 348-20=328