kak tolong dijawab semuanya kak,tolong banget,pakai jalan kak!

1. 3 9/12 : 2 3/4 + 2 5/6 =  45/12 :  11/4 + 17/6
                                      =  45/12 x 4/11 + 17/6
                                      =  45/33 + 17/6
                                      = 45*2/33*2 + 17*11/6*11
                                      = 90/66 + 187/66
                                      = 277/66
                                      = 4 13/66
2. 16/20 = 16*5/20*5 = 80/100 = 0,8
3. 0,52 =  52/100 = 52%
4. 82% = 82/100 = 820/1000
    7/8 = 7*125/8*125 = 875/1000
     3,20 = 320/100= 3200/1000
  urutan pecahan dari terbesar 3200/100, 875/100, 820/100
5. rata nilai ulangan 10 siswa = jumlah nilai ke 10 siswa /10
                                               = (6+7+8+10+5+7+8+7+9+8) / 10
                                               =  75/10
                                               = 7,5

2.16/20=0,8
3.0,52=52/100=52%
4.82%=0,820
7/8=0,875
3,20=3,200
urutab pecahan dari yg terbesar adalah 3,20;7/8;82%
5.rata rata=jumlah data÷banyak data=70÷10=7
6.diket=s=1:800
lpd=p×l=24cm×21cm=504cm
ditan=ls
jawab=ls=lpd÷s=504cm:1/800=504cm×800/1=403.200cm=4.032m
7.k.robi=4/12×120=4×10=40
k.cindi=5/12×120=5×10=50
8.kel belah ketupat=s+s+s+s
9.460=2×2×5×23
10.luas=1/2×phi×r×r=1/2×22/7×14cm×14cm=1×11×2cm×14cm=308cm persegi
1.3 9/12:2 3/4+2 5/6=45/12:11/4+17/6=45/12×4/11+17/6=180/132+17/6=15/11+17/6=90/66+187/66=277/66=4 13/66
maaf kalau salh..smoga mmbantu dan brmanfaay