dtich thua ruong=(75,6+62,4)x40/2=2760m2 dtich trong ngo= 2760x40/100=1104m2 dtich trong khoai=2760x1/3=920m2 dtich trong lac=2760-1104-920=736m²  

so nguyen to phai le 1 so le? ma tong 3 so le khong the la so chan la 42 vay khong co mnp thoa man

cd=30x3=90m hang rao do dai:(90+30)x2-6=234m

9x9x9x140=102060cm²

36/7 9/12 108/28 27/7

6m4cm=604cm do dai canh hv=604/4=151cm

C

135