Question

calculează:c)8,42dm+56m+723dm=?m d)7,52km+23,4hm+1500m=?mm.va roooog repedeeee​

Answer 1

Răspuns:

Explicație pas cu pas:

c)

8,42 dm + 56 m + 723 dm = ? m

= 0,842 m + 56 m + 72,3 m =

= 56,842 m + 72,3 m =

= 129,142 m

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8,42 dm = (8,42 : 10) m = 0,842 m;     dm < m de 10 ori

723 dm = (723 : 10 ) m = 72,3 m

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d)

7,52 km + 23,4 hm + 1500 m = ? mm

= 7 520 m + 2340 m + 1 500 m =

= 9 860 m + 1 500 m =

= 11 360 m =   ( 11360 × 1000)mm     m  > mm de 1000 de ori

= 11 360 000 mm

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7,52 km = (7,52 × 1000)m = 7520 m;    km > m de 1000 de ori

23,4 hm = ( 23,4 × 100) m = 2340 m;    hm > m de 100 de ori