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(15.9*1.25)+arctan(15.9*0.1988)-arctan(15.9*0.1)-arctan(15.9*0.01)-arctan(15.9*0.02)-arctan(15.9*31.25)-arctan(15.9*0.0198) 的值.
    题型：数学计算
    解:
          90+arctan(15.9*1.25)+arctan(15.9*0.1988)-arctan(15.9*0.1)-arctan(15.9*0.01)-arctan(15.9*0.02)-arctan(15.9*31.25)-arctan(15.9*0.0198)
        =90+arctan19.875+arctan(15.9*0.1988)-arctan(15.9*0.1)-arctan(15.9*0.01)-arctan(15.9*0.02)-arctan(15.9*31.25)-arctan(15.9*0.0198)
        =90+arctan19.875+arctan3.16092-arctan(15.9*0.1)-arctan(15.9*0.01)-arctan(15.9*0.02)-arctan(15.9*31.25)-arctan(15.9*0.0198)
        =90+arctan19.875+arctan3.16092-arctan1.59-arctan(15.9*0.01)-arctan(15.9*0.02)-arctan(15.9*31.25)-arctan(15.9*0.0198)
        =90+arctan19.875+arctan3.16092-arctan1.59-arctan0.159-arctan(15.9*0.02)-arctan(15.9*31.25)-arctan(15.9*0.0198)
        =90+arctan19.875+arctan3.16092-arctan1.59-arctan0.159-arctan0.318-arctan(15.9*31.25)-arctan(15.9*0.0198)
        =90+arctan19.875+arctan3.16092-arctan1.59-arctan0.159-arctan0.318-arctan496.875-arctan(15.9*0.0198)
        =90+arctan19.875+arctan3.16092-arctan1.59-arctan0.159-arctan0.318-arctan496.875-arctan0.31482
        =90+1.520524+arctan3.16092-arctan1.59-arctan0.159-arctan0.318-arctan496.875-arctan0.31482
        =90+1.520524+1.264395-arctan1.59-arctan0.159-arctan0.318-arctan496.875-arctan0.31482
        =90+1.520524+1.264395-1.009375-arctan0.159-arctan0.318-arctan496.875-arctan0.31482
        =90+1.520524+1.264395-1.009375-0.15768-arctan0.318-arctan496.875-arctan0.31482
        =90+1.520524+1.264395-1.009375-0.15768-0.307888-arctan496.875-arctan0.31482
        =90+1.520524+1.264395-1.009375-0.15768-0.307888-1.568784-arctan0.31482
        =90+1.520524+1.264395-1.009375-0.15768-0.307888-1.568784-0.304997
        =91.520524+1.264395-1.009375-0.15768-0.307888-1.568784-0.304997
        =92.784919-1.009375-0.15768-0.307888-1.568784-0.304997
        =91.775544-0.15768-0.307888-1.568784-0.304997
        =91.617864-0.307888-1.568784-0.304997
        =91.309976-1.568784-0.304997
        =89.741192-0.304997
        =89.436195
    答案:90+arctan(15.9*1.25)+arctan(15.9*0.1988)-arctan(15.9*0.1)-arctan(15.9*0.01)-arctan(15.9*0.02)-arctan(15.9*31.25)-arctan(15.9*0.0198)=89.436195
    注：弧度制

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