480×17十830×48
=480(17十83)
=480ⅹ100
=48000
480×17+830×48
=480×17+83×480
=480×(17+83)
=480×100
=48000
480×17十830×48
48x(10x17+830)
48x(170+830)
48x1000
48000
480×17+830×48=48×170+830×48=48×(170+830)=48×1000=48000
=48×10×17+48×830
=48×170+48×830
=48×(170+830)
=48×1000
=48000