=(9√2)*(9√2)/2-(5√2)*(5√2)/2算术计算

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=(9√2)*(9√2)/2-(5√2)*(5√2)/2算术计算=(9√2)*(9√2)/2-(5√2)*(5√2)/2算术计算=(9√2)*(9√2)/2-(5√2)*(5√2)/2算术计算=81-

=(9√2)*(9√2)/2-(5√2)*(5√2)/2算术计算
=(9√2)*(9√2)/2-(5√2)*(5√2)/2算术计算

=(9√2)*(9√2)/2-(5√2)*(5√2)/2算术计算
=81-25=56