90 + x = 100

        x = 100 - 90

        x = 10

x - 10 = 90

      x = 90 + 10

     x = 100

x - 90 = 10

      x = 10 + 90

      x = 100

k 

90 + x = 100

x = 100 - 90

x = 10

x - 10 = 90

x = 90 + 10

x = 100

x - 90 = 10

x = 10 + 90

x = 100

a) 927 – 10 x 2 = 927 – 20

                   = 907

b) 163 + 90 : 3 = 163 + 30

                   = 193

c) 90 + 10 x 2 = 90 + 20

                   = 110

d) 106 – 80 : 4 = 106 – 20

                   = 86

20 + 60 + 50 + 80 + 90 + 10 + 50 + 60 x 10

= (20 + 80) + (50 + 50 ) + (90 + 10 ) + 600 + 60

=     100     +      100     +      100     + 660

=              960

=(20+80)+(50+50)+(90+10)+(60*10)+60

=100+100+100+600+60

=960

tự hỏi tự trả lời tí bị trừ điểm hỏi đấp đấy nguyễn minh vũ à

90 + 90 + 90 + 90 + 90 + ( 50 x 10 ) + 90000

=90.5+500+90000

=450+90500

=90950

tick nha

x + 90 = 90 + 10

x + 90 = 100

x        = 100 - 90

x        = 10

x + 90 = 90 + 10

x + 90 = 100

      x   = 100 - 90

      x   = 10

tk mk mk tk lại

10 + 10 + 1 + 10 + 0 + 10 + 90 + 80 +60 +70 + 10987654321 = 10987654662 

tk mk nha!

10987654662 nha

k đi ko hối hận cả đời đó

10*10=100

10*20=200

10*30=300

10*40=400

10*50=500

10*60=600

10*70=700

10*80=800

10*90=900

10*100=1000

10 * 10 = 100

10 * 20 = 200

10 * 30 = 300

10 * 40 = 400

10 * 50 = 500

10 * 60 = 600

10 * 70 =700

10 *80 = 800

10 * 90 = 900

10 * 100 = 1000

a) 90 – ( 30 – 20) = 90 – 10

                   = 80

90 – 30 – 20 = 60 - 20

                  = 40

b) 100 – (60 + 10) = 100 – 70

                   = 30

100 - 60 + 10 = 40 + 10

                   = 50

c) 135 – (30 + 5) = 135 – 35

                   = 100

135 – 30 – 5 = 105 – 5

                   = 100

d) 70 + (40 – 10) = 70 + 30

                   = 100

70 + 40 – 10 = 110 -10

                   = 100

nguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

a) 5760 > 5699

7849 < 8700 

b) 9999 < 10001

10100 > 10080

c) 74685 = 74685

90537 > 90357