Current location - Training Enrollment Network - Mathematics courses - Math problem: Tie a gift box with a ribbon, with a length of 30cm, a width of 20cm, a height of 25cm and a connector head of 25cm. How many ribbons do you need to prepare to tie this gift box?
Math problem: Tie a gift box with a ribbon, with a length of 30cm, a width of 20cm, a height of 25cm and a connector head of 25cm. How many ribbons do you need to prepare to tie this gift box?
Choose d, 30*2+25*2+52*2+20*2+25.

=60+50+ 104+40+25

= 1 10+ 144+25

=254+25

=279 (cm) =27.9 (DM) is about 30 (DM)

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