y x 45 + y x 55 = 12300

y(45+55)=12300

y.100=12300

y=123

y x 45 + y x 55 = 12300 

y x ( 45 + 55 ) = 12300 

y x 100 = 12300 

y = 12300 : 100 

y = 123 

= 1 + 11 + 11 + 11 + 11 = 1 + 4 . 11 = 1 + 44 = 45 

\(100-99+88-77+66-55+44-33+22-11\\ =\left(100-99\right)+\left(88-77\right)+\left(66-55\right)+\left(44-33\right)+\left(22-11\right)\\ =1+11+11+11+11\\ =1+11\times4\\ =1+44\\ =45\)

\(100-99+88-77+66-55+44-33+22-11\)

\(=1+11+11+11+11\)

=45

dễ như ăn kẹo

200......................................

23+55+77+45

=(23+77)+(55+45)

=100+100

=200

23 + 55 + 77 + 45 = (23+77)+(45+55)

                           = 100 +100

                           = 200

55x32/33x56

=11x8x5x4/11x8x3x7

=5x4/3x7

=20/21

20042004x2006/20062006x2000

=10001x2004x2006/10001x2006x2000

=2004/2000=501/500

=55/32 chia cho 32/56+

=55/32x33/56

[ 43 * 11 + 44 * 11 + 45 * 11 +46 *11 + 47 * 11 ] : [ 45 * 55 ]

= [ 11 x (43 + 44 + 45 + 46 + 47) ] : 2475
= 11 x 225 : 2475
= 2475 : 2475
= 1
1 đúng nhé! 100% là đúng 

bang1 tich cho minh nhe

=11*(43+44+45+46+47):(45*55)

=11*225:2475

=2475:2475

=1

(45+75)*66+(75+45)*34

=(45+75)*(66+34)

=120*100

=12000

11+22+33+44+55+66+77+88+99:11

=11+22+33+44+55+66+77+88+9

=(11+9)+(22+88)+(33+77)+(44+66)+55

=20+110*3+55

=20+330+55

=405

Ta có :

a, (45 + 75) x 66 + (75 + 45) x 34

=  (45 + 75) x (66 + 34)

=   120  x 100

=  12000

11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 : 11

= 33 + 77 + 121 + 165 + 9

= 405

\(11+22+33+44+55+66+77+88+99:11\)

\(\left(11+99\right)+\left(22+88\right)+\left(33+77\right)+\left(44+66\right)+55:11\)

\(110+110+110+110+55:11\)

\(440+55:11\)

\(445\)

(45+55)+(28+32)

=100+60

=160

   45 + 28 + 32 + 55

= ( 45 + 55 ) + ( 28 + 32 )

= 100 + 60

= 160.

45  +  28  +  32  +  55

= ( 45 + 55 ) + ( 32 + 28 )

= 100         +       60

= 160

248

nghĩa trần và các bạn xinh đẹp,học giỏi k cho mk nha

mk nhanh nhất

248 nha bn

248