8.400 cm - 650 dm + 12 dam =

8400
6500
12000
=15900cm
=1590dm
=26,9dam
semoga membantu

=8.400 cm
=15.900 cm

=6.500 dm
=1.590 dm

=12 dam
=26,9 dam

=15.900-1.590+26,9
=41,21

maaf kalo salah
dan semoga membantu