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 90-arctan(0.1*7.5)-arctan(0.2*7.5)-arctan(0.0422*7.5)-arctan(11.24*7.5)+arctan(0.4216*7.5)+arctan(1.33*7.5) 的值.
    题型：数学计算
    解:
          90-arctan(0.1*7.5)-arctan(0.2*7.5)-arctan(0.0422*7.5)-arctan(11.24*7.5)+arctan(0.4216*7.5)+arctan(1.33*7.5)
        =90-arctan0.75-arctan(0.2*7.5)-arctan(0.0422*7.5)-arctan(11.24*7.5)+arctan(0.4216*7.5)+arctan(1.33*7.5)
        =90-arctan0.75-arctan1.5-arctan(0.0422*7.5)-arctan(11.24*7.5)+arctan(0.4216*7.5)+arctan(1.33*7.5)
        =90-arctan0.75-arctan1.5-arctan0.3165-arctan(11.24*7.5)+arctan(0.4216*7.5)+arctan(1.33*7.5)
        =90-arctan0.75-arctan1.5-arctan0.3165-arctan84.3+arctan(0.4216*7.5)+arctan(1.33*7.5)
        =90-arctan0.75-arctan1.5-arctan0.3165-arctan84.3+arctan3.162+arctan(1.33*7.5)
        =90-arctan0.75-arctan1.5-arctan0.3165-arctan84.3+arctan3.162+arctan9.975
        =90-0.643501-arctan1.5-arctan0.3165-arctan84.3+arctan3.162+arctan9.975
        =90-0.643501-0.982794-arctan0.3165-arctan84.3+arctan3.162+arctan9.975
        =90-0.643501-0.982794-0.306525-arctan84.3+arctan3.162+arctan9.975
        =90-0.643501-0.982794-0.306525-1.558934+arctan3.162+arctan9.975
        =90-0.643501-0.982794-0.306525-1.558934+1.264494+arctan9.975
        =90-0.643501-0.982794-0.306525-1.558934+1.264494+1.47088
        =89.356499-0.982794-0.306525-1.558934+1.264494+1.47088
        =88.373705-0.306525-1.558934+1.264494+1.47088
        =88.06718-1.558934+1.264494+1.47088
        =86.508246+1.264494+1.47088
        =87.77274+1.47088
        =89.24362
    答案:90-arctan(0.1*7.5)-arctan(0.2*7.5)-arctan(0.0422*7.5)-arctan(11.24*7.5)+arctan(0.4216*7.5)+arctan(1.33*7.5)=89.24362
    注：弧度制

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