5+3=28
9+1=810
8+6=214
5+4=19
THEN:7+3=????
GIAI GIUP MINH VOI!@#$%^&
5+3=28
9+1=810
8+9=214
5+4=19
7+2=?
\(\dfrac{1}{4}\)+\(\dfrac{3}{4}\):\(\dfrac{-6}{-7}\)
giup minh giai chi tiet voi
\(\dfrac{1}{4}+\dfrac{3}{4}:\dfrac{-6}{-7}=\dfrac{1}{4}+\dfrac{3}{4}:\dfrac{6}{7}=\dfrac{1}{4}+\dfrac{3}{4}\times\dfrac{7}{6}=\dfrac{1}{4}+\dfrac{7}{8}=\dfrac{9}{8}\)
ko rảnh giải chi tiết nên:
\(\dfrac{9}{8}\)
Cac ban giai giup minh bai nay voi
a 1+(-3)+2+(-4)+3+(-5)+...+98+(-100)
b 1+(-5)+2+(-6)+3+(-7)+...+99+(-103)
a) = -2 -2 -2 ... -2 -2 =50(-2)=-100
cho a = 1/2 + 3/4 +5/6 +7/8 + .... + 79/80
CTR , a<1/9
giai giup minh voi nhe
Ta có: a = (1 - 1/2) + (1 - 1/4) + (1 - 1/6) +...+ (1 - 1/80)
= (1 + 1 + 1 +...+ 1) - (1/2 + 1/4 + 1/6 + ... + 1/80)
= 40 - ...
Tinh tong :
A = 1/1*3 + 1/3*5 + 1/5*7 + ..... + 1/99*101
B = 1 + 1/3 + 1/6 + 1/10 + ..... + 1/630
Giup minh voi nha ! Ai dung minh *** cho !
Giai ro rang ho minh voi !
B = \(1+\frac{1}{3}+\frac{1}{6}+....+\frac{1}{630}=1+\frac{2}{6}+\frac{2}{12}+...+\frac{2}{1260}\)
B = \(1+2\left(\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{35.36}\right)\)
B = \(1+2\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{35}-\frac{1}{36}\right)\)
B = \(1+2\left(\frac{1}{2}-\frac{1}{36}\right)=1+2.\frac{17}{36}\)
B = \(1+\frac{17}{18}\)
B = \(\frac{35}{18}\)
\(A=\frac{1}{1x3}+\frac{1}{3x5}+\frac{1}{5x7}+...+\frac{1}{99x101}\)
\(A\)\(x2=\frac{2}{1x3}+\frac{2}{3x5}+\frac{2}{5x7}+...+\frac{2}{99x101}\)
\(A\)\(x2=1-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{99}-\frac{1}{101}\)
\(A\)\(x2=1-\frac{1}{101}=\frac{100}{101}\)
\(A=\frac{100}{101}:2=\frac{100}{101}x\frac{1}{2}=\frac{50}{101}\)
4x+3/5 - 6x-2/7 = 5x+4/3 + 3
mong cac ban giai giup minh voi
\(\frac{4x+3}{5}-\frac{6x-2}{7}=\frac{5x+4}{3}+3\\ \Leftrightarrow2x\cdot\left(4x+3\right)-15\cdot\left(6x-2\right)=35\cdot\left(5x+4\right)+315\\ \Leftrightarrow80x+63-90x+30=175x+140+315\\ \\\Leftrightarrow-6x+93=175x+455\\ \Leftrightarrow93=175x+455+6x\\ \Leftrightarrow93=181x+45\\ \Leftrightarrow-362=181x\\ \Rightarrow x=-\frac{362}{181}=-2\)
Tinh:
\(\frac{\frac{1}{3}-\frac{1}{4}+\frac{1}{5}}{\frac{7}{6}-\frac{7}{8}+\frac{7}{10}}\)
Giup minh trinh bay cach cach giai voi nhe
Ko hieu vao phan"Doc them"
\(\frac{\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{5}\right)}{\frac{7}{2}\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{5}\right)}\)=\(\frac{1}{\frac{7}{2}}\)=\(\frac{2}{7}\)
3/4 tuoi bo bang 5/6 tuoi me. Tinh ti so tuoi bo va me
Ai giai giup minh voi !
3/4 tuổi bố = 5/6 tuổi mẹ.Suy ra:15/20 tuổi bố=15/18tuoi me.
Suy ra tuổi mẹ 18 phần,tuổi bố 20 phần
Vậy tỉ số tuổi bố và mẹ là 18/20
Ta có
3/4=18/24
5/6=20/24
=>18/24 tuổi bố=20/24 tuổi mẹ
Hay tuổi bố =18/20 tuổi mẹ
18/20=9/10
Vậy tuổi bố =9/10 tuổi mẹ
3 va 1/11 x 27 va 27/46 x 1 va 6/17 x 2 va 4/9 = .....
giai giup minh voi minh gap qua
\(3\frac{3}{11}x27\frac{27}{46}x1\frac{6}{17}x2\frac{4}{9}=\frac{34x1269x23x22}{11x46x17x9}=\frac{2x17x141x9x23x2x11}{11x23x17x9}=282\)