∵x*(40-x)/2=180
==>40x-x²=360
==>x²-40x=360
==>x²-40x+400=760
==>(x-20)²=760
==>x-20=±2√190
==>x=20±2√190
==>x=2(10±√190)
∴原方程的解是:x=2(10±√190)
∵x*(40-x)/2=180
==>40x-x²=360
==>x²-40x=360
==>x²-40x+400=760
==>(x-20)²=760
==>x-20=±2√190
==>x=20±2√190
==>x=2(10±√190)
∴原方程的解是:x=2(10±√190)