7.3.14*1.5*1.5=7.065 7.065*2=14.13 14.13*750=10597.5=10.5975
8.3.14*1*1=3.143.14*0.25=0.785 35-0.785=34.215
9. 6/2=3 3.14*3*3*11=310.86 310.86*3=932.58=932.58 932.58＞800
10. 81/4.5=1818*3=54
采纳吧= =