Tolong di jawab dong, yang bisa matematika kelas 8

i.
[tex] \frac{22}{7} \times 14 \times \frac{1}{2} \times 2 = 44[/tex]
[tex]28 \times 2 + 44 = 100[/tex]
ii.
[tex]3.14 \times 20 \div 4 = 15.7[/tex]

15.7+20=35.7

iii
22/7×1/2×21=33
33+21×3=96

iv
3.14×20×1/2= 31.4
31.4×10×1/2×2=31.4
31.4+31.4=62.8