15Ⅹ26Ⅹ125怎样简便
解:采用拆分法和结合律,
原式=15x26x125
=15x125x(24+2)
=15x125x24+15x125x2
=15x3x125x8+30x125
=45x1000+3750
=45000+3750
=48750
原式=15x26x125
=15x125x(24+2)
=15x125x24+15x125x2
=15x3x125x8+30x125
=45x1000+3750
=45000+3750
=48750
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