bằng 1230                                                                                              

k mk nha

112+114+116+118+120+122+124+126+148+130=1230

chúc bn hok giỏi

112+114+116+118+120+122+124+126+148+130

=1230

đ/s: 1230

=(112+128)+(114+126)+(116+124)+(118+122)+120

=240+240+240+240+120

= 120+120+120+120+120+120+120+120+120

= 120 x 9 

= 1080

tich nha ban oi , thanks

=(112+118)+(114+126)+(118+122)+120+116

=230+240+240+120+116

=470+360+116

=830+116

=946

112+114+116+118+120+122+126+128

=(112+128)+(114+126)+(118+122)+120+116

=240+240+240+120+116

=240x3+120+116

=720+120+116

=840+116

=956

bạn giải dùm mik bài đó luk được hok

\(\frac{x+1}{125}+\frac{x+2}{124}+\frac{x+3}{123}+\frac{x+4}{122}+\frac{x+146}{5}=0\)

\(\left(\frac{x+1}{125}+1\right)+\left(\frac{x+2}{124}+1\right)+\left(\frac{x+3}{123}+1\right)+\left(\frac{x+4}{122}+1\right)+\left(\frac{x+146}{5}-4\right)=0\)

\(\frac{x+126}{125}+\frac{x+126}{124}+\frac{x+126}{123}+\frac{x+126}{122}+\frac{x+126}{5}=0\)

\(\left(x+126\right).\left(\frac{1}{125}+\frac{1}{124}+\frac{1}{123}+\frac{1}{122}+\frac{1}{5}\right)=0\)

vì \(\left(\frac{1}{125}+\frac{1}{124}+\frac{1}{123}+\frac{1}{122}+\frac{1}{5}\right)\ne0\)nên x + 126 = 0 \(\Rightarrow\)x = -126

127

                  127                 

Tìm x

a) X x 15 + X x 13 = 560 x 45

( X + X x 2 ) : 34 = 504

360 : X - 126 = X = 6

58 x X - 934 = 6722

14968 - X x 5 = 4968

b) X x 125 - X x 73 = 1196

246 : X = 34 : X = 5

2005 + X x 34 = 5337

X : 1234 = 127 ( dư 360 )

nhìn rối thế

\(A=\dfrac{3^{123}+1}{3^{125}+1}\Leftrightarrow3^2A=\dfrac{3^{125}+9}{3^{125}+1}\)

\(9A=\dfrac{3^{125}+1}{3^{125}+1}+\dfrac{8}{3^{125}+1}=1+\dfrac{8}{3^{125}+1}\)

\(B=\dfrac{3^{122}+1}{3^{124}+1}\Leftrightarrow3^2B=\dfrac{3^{124}+9}{3^{124}+1}\)

\(9B=\dfrac{3^{124}+1+8}{3^{124}+1}+\dfrac{3^{124}+1}{3^{124}+1}+\dfrac{8}{3^{124}+1}=1+\dfrac{8}{3^{124}+1}\)

\(9A< 9B\Leftrightarrow A< B\)

a,15129>15128

b,971208<971210