=80x12.25+160x3.5x1.5+2.25=980+840+2.25=1822.25
80×7/2×7/2+160×7/2×3/2+2.25=980+840+2.25=1822.25
完全平方公式,答案为(√80×3.5+1.5)^2
14962.5