32×(25+125)×64
=(8×25+8×125)×256
=(200+1000)×256
=200×256+1000×256
=51200+256000
=307200
原式=4×8x(25十125)×64
=(4x25X8十8x125x4)x64
=(800十4000)Ⅹ64
=4800x64
=307200
如图所示
32*(25+125) =(4x8)*(25+125) =(4x25)*(8x125) =100*1000
32×(25+125)×64
=32x(25+125)x8x8
=(32x8)x(25x8+125x8)
=256x(200+1000)
=256x1200
=307200