简便计算如下：
2.5×0.6-1.8×0.5
＝2.5×0.6-0.6×3×0.5
＝2.5×0.6-0.6×1.5
＝（2.5-1.5）×0.6
＝1×0.6
＝0.6
2.5x0.6-1.8x0.5 =0.5×5×0.6-0.3×6×0.5 =0.5×3-0.3×3 =0.2×3 =0.6
2.5×0.6-1.8×0.5
=2.5×0.6-0.6×（3×0.5）
=2.5×0.6-0.6×1.5
=（2.5-1.5）×0.6
=0.6
1.5-0.9=0.6
2.5×0.6-0.6×1.5=2.5×0.6-0.6×3×0.5= 0.6x（2.5-1.5）=0.6×1=0.6
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