简便计算0.92×3.2-0.42×3.8怎么写啊

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简便计算0.92×3.2-0.42×3.8怎么写啊
简便计算0.92×3.2-0.42×3.8
怎么写啊

简便计算0.92×3.2-0.42×3.8怎么写啊
简便计算
0.92×3.2-0.42×3.8
=(1-0.08)*3.2-(0.5-0.08)*3.8
=3.2-0.08*3.2-1.9+0.08*3.8
=1.3+0.08*0.6
=1.78

0.92×3.2-0.42×3.8
=(0.5+0.42)x3.2-0.42x3.8
=0.5x3.2+0.42x3.2-0.42x3.8
=1.6+0.42x(3.2-3.8)
=1.6+0.42x(-0.6)
=1.6-0.252
=1.348

0.92×3.2-0.42×3.8
=0.92x3.2-0.42x(3.2+0.6)
=0.92x3.2-0.42x3.2-0.42x0.6
=(0.92-0.42)x3.2-0.42x0.6
=5x3.2-0.42x0.6
=1.6-0.42x0.6
=1+0.6-0.42x0.6
=1+(1-0.42)x0.6
=1+0.58x0...

全部展开

0.92×3.2-0.42×3.8
=0.92x3.2-0.42x(3.2+0.6)
=0.92x3.2-0.42x3.2-0.42x0.6
=(0.92-0.42)x3.2-0.42x0.6
=5x3.2-0.42x0.6
=1.6-0.42x0.6
=1+0.6-0.42x0.6
=1+(1-0.42)x0.6
=1+0.58x0.6
=1+0.5x0.6+0.08x0.6
=1+0.3+0.048
=1.348

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