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125x17x4用简便计算

(125x17)x82=125x2x17x41=250x697=250x696+250=250x4x174+250=1000x174=250=174000+250=174250

125x(17x8)x4=125x8x(4x17)=1000x68=68000

125x25x4x4用简便计算=(125x4)x(25x4)=500x100=50000

125x17x8x4=125*8*17*4=1000*68=68000

用简便方法计算125X25X4125X25X4=125*(25*4)=125*100=12500

解:125X25X4 =125X(25X4) =125X100 =12500朋友,还有不懂的地方,请追问,如果懂了,就采纳了呗.

最简便的方法:125x17x8=125x8x17=1000x17=17000

=(125*4)*(25*4) =500*100 =50000

原式=125x(8x9)x7=(125x8)x(9x7)=1000x63=63000

125174x825x5x20=(125x8)x(25x4)x(5x20)x17=1000x100x100x17=170000000

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