tolong bantuu nomor 1 sampai 5 plisss

1. 7^2 - 3(6) = 49-18=31 (((D)))
2. 1/100 - 1/125 = 5/500 - 4/500 = 1/500 (((A)))
3. 3√5 x √35 = 3√175 = 15√7 (((B)))
4. 8(3-√5) / 9-5 = 2(3-√5) (((B)))
5. panjang sebenarnya = 2/1:200 = 2x200 = 400cm = 4m
lebar sebenarnya = 1,25/1:200 = 1,25x200 = 250cm = 2,5m
luas = 4x2,5=10m^2 (((D)))