(-2/3根号42)*(-6根号56)

问题描述:

(-2/3根号42)*(-6根号56)

(-2/3根号42)*(-6根号56)
=-2/3*(-6)*根号42根号56
=4根号(42*56)
=4根号(2*3*7*2*4*7)
=4*2*7根号12
=56根号12