12.5x0.69x8的简便方法：
12.5x0.69x8
=12.5×8×0.69
=100×0.69
=69
12.5*8*0.69=12.5*2*4*0.69
=25*4*0.69
=100*0.69
=69
12.5×0.69×8
=（12.5×8）×0.69
=100×0.69
=69
原式=12.5×8×0.69
=100×0.69
=69
12.5×0.69×8
=12.5×8×0.69
=100×0.69
=69
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