3.35*6.4*2+6.7*3.6
= (3.35*2)*6.4+6.7*3.6
=6.7*6.4+6.7*3.6
=(6.4+3.6)*6.7
=10*6.7
=67
【么么、应该是这样吧、有点长哦、呵呵】