1)
C = 15 × 1000000000000 × 2,4 × 0,0000001
= 15000000000000 × 0,00000024
= 3600000
D = (18 × 10000000 × 0,001) ÷ (24 × 0,00001)
= (180000000 × 0,001) ÷ 0,00024
= 180000 ÷ 0,00024
= 750000000
E = (12 × 0,000000001 × 5 × 100) ÷ (24 × 0,01)
= (0,000000012 × 500) ÷ 0,24
= 0,000024 ÷ 0,24
= 0,0001