16×2×3.14+16×16×3.14×2=16×2×3.14×(1+17)=16×2×3.14×18=1708.1616×2×3.14+16×16×3.14×2=3.14×(16×2+16×16×2)=3.14×(32+32×16)=3.14×544=1708.16