(7+X)x4+X=108

=> 28+4X+X=108

=> 5X=108-28

=> 5X =80

=> X=16 

x+27+7*x=108

x+7*x=108-27=81

8*x=81

x=81/8

\(\dfrac{x}{5}\) = \(\dfrac{48}{60}\)

\(x\) = \(\dfrac{48}{60}\) \(\times\) 5

\(x\) = 4

\(\dfrac{x}{7}\) = \(\dfrac{16}{56}\)

\(x\)  = \(\dfrac{16}{56}\) \(\times\) 7

\(x\)  = 2

\(\dfrac{8}{x}\) = \(\dfrac{72}{108}\)

\(x\) = 8 : \(\dfrac{72}{108}\)

 \(x\) = 12

\(x\) - \(\dfrac{3}{12}\) = \(\dfrac{35}{84}\)

\(x\)         = \(\dfrac{35}{84}\) + \(\dfrac{3}{12}\)

\(x\)         = \(\dfrac{2}{3}\)

x-3 phần 12 cô ơi

a, x = 108 : ( 2 + 3 + 4 )

x = 108 : 9

x = 12

b, x = 104 : (23 - 8 -7 )

x = 104 : 8

x = 13

a)bằng:2x+3x+4x=9x

108:9=12

b)bằng:23x-8x-7x=8x

104:8=13

nhơ cho mình một coin

giúp mềnh đi mà

=(1+2+3+4+5+6+7+.....+108+109)x(2014x(3-2-1))

=(1+2+3+4+5+6+7+.....+108+109)x(2014x0)

=Ax0

=0

   ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 ) x ( 2014 x 3  - 2014 x 2 - 2014 )

= ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 ) x              0

=                      0

0 nhân với số nào cũng bằng 0

9700 : 100 + 36 x 12 = 529

(160 x 5 - 25 x 4) : 4= 175

108 x (23 + 7) = 3240

215 x 86 + 215 x 14 = 21500

3 x 128 - 43 x 128= -5120

529

175

3240

21500

-5120 (lớp 4 học âm hẻ)

a) 36 x 25 x 4 = 36 x ( 25 x 4) = 36 x 100 = 3600

18 x 24 : 9= 24 x ( 18:9) = 24 x 2 = 48

41 x 2 x 8 x 5= 41 x 8 x ( 5x2) = 41 x 8 x 10 = 3280

b) 108 x (23 + 7)= 108 x 30 = 3240 

215 x 86 + 215 x 14 = 215 x ( 86 + 14) = 215 x 100 = 21500 

53 x 128 – 43 x 128= 128 x ( 53 - 43) = 128 x 10 = 1280

\(a,35\times25\times4=36\times100=3600\)

\(18\times24:9=18:9\times24=2\times24=48\)

\(41\times2\times8\times5=\left(2\times5\right)\times\left(41\times8\right)=10\times328=3280\)

\(b,108\times\left(23+7\right)=108\times30=3240\)

\(215\times86+215\times14=215\times\left(86+14\right)=215\times100=21500\)

\(53\times128-43\times128=128\times\left(53-43\right)=128\times10=1280\)