Question

化简:(√2.7-√0.2+√1.2-√3.2)(4√2+√3+√27)

Answer 1

原式=(3√0.3-√0.2+2√0.3-4√0.2)(4√2+√3+3√3)

=(-√0.3+√0.2)(4√2+4√3)

=-4√0.6-4√0.9+4√0.4+4√0.6

=-4√0.9+4√0.4

=-12√10/10+8√10/10

=-2√10/5