tolong di bantu kak

1.A. 70m- 50dam- 46dm=.......m
70m- 500m - 4,6m= 425,4m

B. 8km + 5hm - 21dam = .....HM
80hm + 5hm + 2,1hm = 82,9hm

C. 200cm - 5dm +20m =....dam
0,2dam - 0,05+2dam= 2,15

D. 5km +20m-20hm= ....km
5km+0,02km-2km=3,02km

2. 100cm-1,75m=...m
1m-1,75m= 0,75m

1 a. 70m + (50x10)m - (46:10)m = 70m + 500m - 4,6m = 565,4 m

   b. (8x10)hm + 5hm - (21:10)hm = 80hm + 5hm -2,1hm = 82,9 hm

   c. (2000:1000)dam - (5:100)dam + (20:10)dam = 2dam - 0,05dam + 2dam                                                                                    = 3,95 dam

   d. 5km + (20:1000)km - (20:10)km = 5km + 0,02km - 2km = 3,02 km

2. Tali yg dibutuhkan = 1,75 m
    Tali yg ada = 100cm = 1 m
    Tali yg kurang ialah 1,75 m - 1 m = 0,75 m

3. Luas dinding yg hrs dicat = 300 m
    Dinding yg sudah tercat ; putih = 30m 
                                             biru  = 17 dam = 170m
                                             merah =400 dm = 40m
    Total dinding yg sudah dicat = 30m + 170m + 40m = 240m
     Dinding yg belum dicat ialah 300m - 240m = 60 m