总述：本次共解1题。其中
           ☆算术计算1题

〖1/1算式〗
    作业：求算式 ((50%-21%)^2*0.3+(30%-21%)^2*0.2+(10%-21%)^2*0.3+(-15%-21%)^2*0.2)^(1/2) 的值.
    题型：数学计算
    解:
          ((50%-21%)^2*0.3+(30%-21%)^2*0.2+(10%-21%)^2*0.3+(-15%-21%)^2*0.2)^(1/2)
        =(0.29^2*0.3+(30%-21%)^2*0.2+(10%-21%)^2*0.3+(-15%-21%)^2*0.2)^(1/2)
        =(0.29^2*0.3+0.09^2*0.2+(10%-21%)^2*0.3+(-15%-21%)^2*0.2)^(1/2)
        =(0.29^2*0.3+0.09^2*0.2+(-0.11)^2*0.3+(-15%-21%)^2*0.2)^(1/2)
        =(0.29^2*0.3+0.09^2*0.2+(-0.11)^2*0.3+(-0.36)^2*0.2)^(1/2)
        =0.0564^(1/2)
        =0.0564^0.5
        =0.237486841740758
    答案:((50%-21%)^2*0.3+(30%-21%)^2*0.2+(10%-21%)^2*0.3+(-15%-21%)^2*0.2)^(1/2)=0.237486841740758

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