0.25×（4+0.8）
=0.25×4+0.25×0.8
=1+0.2
=1.2
0.26×15.4-2.6×0.54
=2.6×1.54-2.6×0.54
=2.6×（1.54-0.54）
=2.6×1
=2.6
用简便方法计算 第一题：0.25×（4+0.8) 第二题：0.26×15.4-2.6×0.54
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