Question

Tinh hop li

32+34+36+38-10-12-14-16-18

Answer 1

= (32-12)+(34-14)+(36-16)+(38-18)-10

= 20+20+20+20-10

= 80-10

= 70

Answer 2

32+34+36+38-10-12-14-16-18

=(32-12)+(34-14)+(36-16)+(38-18)-10

=20+20+20+20-10

=20 x 4-10

=80-10

=70

Answer 3

=(32+38)+(34+36)-(12+18)-(16+18)

=70+70-30-30

=80

Answer 4

32+34+36+38-10-12-14-16-18

=(32-12) + ( 34-14 ) + (36-16) + (38-18) + 10

= 20+20+20+20+10

=90