Tìm m: 3/4-3/2.4/3+3/2 /-9/4 <2m<15/23.1/3+1/15.90/138+2/5.(-49/69)
Những câu hỏi liên quan
3.Tìm X:
2/2.4+2/4.6+....=2/x.(x+2)=4/9
\(\dfrac{2}{2.4}+\dfrac{2}{4.6}+...+\dfrac{2}{x\left(x+2\right)}=\dfrac{4}{9}\)
\(\Rightarrow\dfrac{1}{2}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{6}+...+\dfrac{1}{x}-\dfrac{1}{x+2}=\dfrac{4}{9}\)
\(\Rightarrow\dfrac{1}{2}-\dfrac{1}{x+2}=\dfrac{4}{9}\)
\(\Rightarrow\dfrac{x+2-2}{2\left(x+2\right)}=\dfrac{4}{9}\)
\(\Rightarrow\dfrac{x}{2x+4}=\dfrac{4}{9}\)
\(\Rightarrow9x=8x+16\)
\(\Rightarrow x=16\)
Vậy x = 16
Đúng 0
Bình luận (1)
B=2^6.3^5-9^2.4^3 phan 4^3.9^3-3^4.8^2
\(B=\frac{2^6.3^5-9^2.4^3}{4^3.9^3-3^4.8^2}\)
Đúng ko bn
Mk nghĩ nó phải là 36
Bài 1. Tìm m để với mọi y>9 ta có m(căn y -3)(-4y)/(3-căn y) > y+1
Bài 2. Tìm m để phương trình x^2+4(m-1)x-12=0 có 2nghiệm pb x1, x2 thỏa mãn 4|x1-2|Căn (4-x2)=(x1+x2-x1x2-8)^2
Bạn nên viết đề bằng công thức toán (biểu tượng $\sum$ góc trái khung soạn thảo) để được hỗ trợ tốt hơn.
Đúng 0
Bình luận (0)
75%-1 1/2.4/3+1,5:-9/4
(1 1/2+x).1 3/4++=8/7
|x-1!=3/5
a) 407 - [(190 - 170) : 4 + 9] : 2
b) (23.36 - 17.36) : 36
c) 3.5^2 - 27 : 3^2 + 5^2.4 - 18 : 3^2
B)TK:
+)(23.36-17.36):36
=[36.(23-17)]:36
=36.6:36
=(36:36).6
=1.6
=6
Đúng 1
Bình luận (0)
B1:Tính nhanh:
a)M= -1/3 . 141/17 - 39/3 . -1/17
b)N= -9/16 . 13/3 - (-3/4)^2 . 19/3
c)P=(1+1/1.3) (1+1/2.4) (1+1/3.5)......(1+1/99.101)
B2:Tìm x,biết
a)1/2+3/2:x=1/4
b)3/4+1/4.x=7
c)1/2.4 + 1/4.6 +.........+1/(2x-2).2x = 11/48
B3:Tìm x,biết
a)(x-1/2)^2=1/81
b)x+x(1+1/x)+x(1+2/x)=1/3
c)2/x+4=3/x+5
B1:Tính
a)(-2/3+3/7):4/5+(-1/3+4/7):4/5
b)5/9:(1/11-5/22)+5/9:(1/15-2/3)
c)4^2.4^3/4^10
d)(0,6)^5/(0,2)^6
e)2^7.9^3/6^5.8^2
g)6^3+3.6^2+3^3/-13
h)(3/7+1/2)^2
i)(3/4-5/6)^2
k)5^4.20^44/25^5.4^5
l)(-10/3)^5.(-6/5)^4
f)(1+2/3-1/4).(4/5-3/4)^2
m)2:(1/2-2/3)^3
n)9.9.(-1/3)^3+1/3
y)(4.2^5):(2^3.1/16)
a) \(\left(-\dfrac{2}{3}+\dfrac{3}{7}\right):\dfrac{4}{5}+\left(-\dfrac{1}{3}+\dfrac{4}{7}\right):\dfrac{4}{5}\)
\(=\left(-\dfrac{5}{21}\right):\dfrac{4}{5}+\left(\dfrac{5}{21}\right):\dfrac{4}{5}\)
\(=\left(-\dfrac{5}{21}+\dfrac{5}{21}\right):\dfrac{4}{5}\)
\(=0:\dfrac{4}{5}\)
\(=0\)
b) \(\dfrac{5}{9}:\left(\dfrac{1}{11}-\dfrac{5}{22}\right)+\dfrac{5}{9}:\left(\dfrac{1}{15}-\dfrac{2}{3}\right)\)
\(=\dfrac{5}{9}:\left(-\dfrac{3}{22}\right)+\dfrac{5}{9}:\left(-\dfrac{3}{5}\right)\)
\(=\dfrac{5}{9}:\left[\left(-\dfrac{3}{22}\right)+\left(-\dfrac{3}{5}\right)\right]\)
\(=\dfrac{5}{9}:\left(-\dfrac{81}{110}\right)\)
\(=-\dfrac{550}{729}\)
c) \(4^2.4^3:4^{10}\)
\(=\dfrac{4^5}{4^{10}}\)
\(=\dfrac{1}{4^5}\)
\(=\dfrac{1}{256}\)
d) \(\left(0,6\right)^5:\left(0,2\right)^6\)
\(=\dfrac{\left(0,2\cdot3\right)^5}{\left(0,2\right)^6}\)
\(=\dfrac{\left(0,2\right)^5\cdot3^5}{\left(0,2\right)^6}\)
\(=\dfrac{243}{0,2}\)
\(=1215\)
Mai mốt bạn đăng một lần ít thôi nha tại giờ khuya quá nên mình chỉ làm đến đây thôi =))
Đúng 0
Bình luận (0)
B1:Tính nhanh:
a)M -1/3 . 141/17 - 39/3 . -1/17
b)N -9/16 . 13/3 - (-3/4)^2 . 19/3
c)P(1+1/1.3) (1+1/2.4) (1+1/3.5)......(1+1/99.101)
B2:Tìm x,biết
a)1/2+3/2:x1/4
b)3/4+1/4.x7
c)1/2.4 + 1/4.6 +.........+1/(2x-2).2x 11/48
B3:Tìm x,biết
a)(x-1/2)^21/81
b)x+x(1+1/x)+x(1+2/x)1/3
c)2/x+43/x+5
Giải gấp hộ mk cái mấy bn ơi
Đọc tiếp
B1:Tính nhanh:
a)M= -1/3 . 141/17 - 39/3 . -1/17
b)N= -9/16 . 13/3 - (-3/4)^2 . 19/3
c)P=(1+1/1.3) (1+1/2.4) (1+1/3.5)......(1+1/99.101)
B2:Tìm x,biết
a)1/2+3/2:x=1/4
b)3/4+1/4.x=7
c)1/2.4 + 1/4.6 +.........+1/(2x-2).2x = 11/48
B3:Tìm x,biết
a)(x-1/2)^2=1/81
b)x+x(1+1/x)+x(1+2/x)=1/3
c)2/x+4=3/x+5
Giải gấp hộ mk cái mấy bn ơi
1. a, M = -\(\dfrac{1}{3}.\dfrac{141}{17}-\dfrac{39}{3}.\left(-\dfrac{1}{17}\right)\)
= -\(\dfrac{1}{17}.\dfrac{141}{3}-\dfrac{39}{3}.\left(-\dfrac{1}{17}\right)\)
= -\(\dfrac{1}{17}\left(\dfrac{141}{3}-\dfrac{39}{3}\right)\)
= -\(\dfrac{1}{17}.34\)
= -2
@Lê Thị Hồng Ngát
Đúng 0
Bình luận (0)
1. b, \(\dfrac{3}{4}+\dfrac{1}{4}x=7\)
<=> \(\dfrac{1}{4}x=\dfrac{25}{4}\)
<=> x = 25
@Lê Thị Hồng Ngát
Đúng 0
Bình luận (0)
1. b, N = -\(\dfrac{9}{16}.\dfrac{13}{3}-\left(-\dfrac{3}{4}\right)^2.\dfrac{19}{3}\)
= -\(\dfrac{9}{16}.\dfrac{13}{3}+\dfrac{9}{16}.\dfrac{19}{3}\)
= \(\dfrac{9}{16}\left(-\dfrac{13}{3}+\dfrac{19}{3}\right)\)
= \(\dfrac{9}{16}.2\)
= \(\dfrac{9}{8}\)
@Lê Thị Hồng Ngát
Đúng 0
Bình luận (0)
(75.5^4+175.5^4):(20.25.125-625.75)
[(3^2.5^2.4^3):(2^3.3^2)] .2005^0
(3.4.2^16)^2:(11.2^13.4^11-16^9)
194.12+6.437.2+3.369.4
(1^2+2^2+3^2+...+1000^2) (91-273:3)
a: \(=\dfrac{5^4\left(75+175\right)}{5^6\cdot4-5^4\cdot5^2\cdot3}=\dfrac{5^4\cdot250}{5^6}=10\)
b: \(=\dfrac{3^2\cdot5^2\cdot2^6}{2^3\cdot3^2}=\dfrac{5^2\cdot2^3}{1}=25\cdot8=200\)
c: \(=\dfrac{\left(3\cdot2^{18}\right)^2}{11\cdot2^{13}\cdot2^{22}-2^{36}}\)
\(=\dfrac{3^2\cdot2^{36}}{11\cdot2^{35}-2^{36}}=\dfrac{3^2\cdot2^{36}}{2^{35}\left(11-2\right)}=2\)
d: \(=12\left(194+437+369\right)=12000\)
e: \(=A\cdot\left(91-91\right)=0\)
Đúng 0
Bình luận (0)