原式=12.5x0.8x0.4+2.5ⅹ0.4x0.8
=10ⅹ0.4+1x0.8
=4+0.8
=4.8
（12.5+2.5）×0.8×0.4
=12.5×0.8×0.4+2.5×0.4×0.8
=10×0.4+1×0.8
=4+0.8
=4.8
计算
(12.5+2.5)0.8*0.4
=15*0.8*0.4
=12*0.4
=4.8
(12.5+2.5)x0.8x0.4
=15x0.8x0.4
=12x0.4
=4.8
（12.5+2.5）*0.8*0.4
=15*0.8*0.4
=12*0.4
=4.8
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