Tìm x :

[ 500 : (x - 10) x 2 ] + 100 = 200

=>       500 : ( x - 10 ) x 2 = 200 - 100

=>       500 : ( x - 10 ) x 2 = 100

=>             500 : ( x - 10 ) = 100 : 2

=>             500 : ( x - 10 ) = 50

=>                         x - 10 = 500 : 50

=>                         x - 10 = 10

=>                                x = 10 + 10

=>                                x = 20

                                  Vậy x= 20 

[500 : (x-10) x 2] + 100 = 200

500 : (x-10) x 2 = 100

=> 500 : (x-10) = 50

=> x - 10 = 10

=> x =20

X x 100 + X x 200 + X x 300 + X x 400 + X x 500 + X x 512 = 2012

X x (100 + 200 + 300 + 400 + 500 + 512) = 2012

X x 2012 = 2012

        X    = 2012 : 2012

        X    = 1

thanks.

X * 100 + X* 200 + X * 300 + X * 400 + X * 500 + X * 512 = 2012

                        X * (100 + 200 + 300 + 400 + 500 + 512) = 2012

                                                                      X * 2012 = 2012

                                                                                X = 2012 : 2012

                                                                                X = 1

Vậy X bằng 1

X x 100 + X x 200 + X x 300 + X x 400 + X x 500 + X x 512 = 2012

X x ( 100 + 200 + 300 + 400 + 500 + 512 ) = 2012

X x 2012 = 2012

X = 2012 : 2012

X = 1

500 + x = 100 + 500

500 + x = 600

          x = 600 - 500

          x = 1001

300 - x = 300 + 200

300 - x = 500

         x = 300 - 500

         x = -200

400 - x = 200 + 400

400 - x = 600

         x = 400 - 600

         x = -200

k mk nha mk k l

ại ^_^

500 + 100 = 100 + 500

300 + 200 =  300 + 200

400 + 200  = 200 + 400

500+x=100+500

vay x =100

300-x=300+200

vay x= - 200

400-x=200+400

vay x= -200

a) x= -300 -100

x = -400

b) x= -300 +100

x= -200 

1)x+100=200-500

x+100=-300

x=-300-100

x=-400

2)x-100=200-500

x-100=-300

x=-300+100

x=-200

\(x+100=200-500\)

\(x+100=-300\)

\(x=-300-100\)

\(x=-400\)

\(x-100=200-500\)

\(x-100=-300\)

\(x=-300+100\)

\(x=-200\)

500 + 500 = 1 000

100 + 100 = 200

200 + 200 = 400

2 000 x 20 = 40 000

500 + 500 = 1000

100 + 100 = 200

200 + 200 = 400

2000 x 20 = 40000

500+500=1000

100+100=200

200+200=400

2000x20=4000

k mình nha

500 - x = 200 + 100

500 - x = 300

x = 500 - 300

x = 200

500 - x = 200 + 100

500 - x = 300

        x = 500 - 300

        x = 200

500 - x = 200 + 100

500 - x = 300

        x = 500 - 300

        x = 200

ai k minh thi minh k lai

100x200+200x500+200x400

=20000+100000+80000

=120000+80000

=200000

100 x 200 + 200 x 500 + 200 x 400

= 200 x ( 100 + 500 + 400 )

= 200 x 1000

= 200000

100x200+200x500+200x400

=20000+100000+80000

=120000+80000

=200000

b) 200 x 4 = .800.....              300 x 2 = ..600....

200 x 2 = .400.....             300 x 3 = ...900...

400 x 2 = ...800...             500 x 1 = ..500....

100 x 4 = ..400....             100 x 3 = .300.....

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