2.8*3.6+2.8 简算

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2.8*3.6+2.8 简算
2.8*3.6+2.8 简算

2.8*3.6+2.8 简算
2.8*3.6+2.8
=2.8*(3.6+1)
=2.8*(5-0.4)
=2.8*5-2.8*0.4
=14-1.12
=12.88

2.8*3.6+2.8
=2.8(3.6+1)
=2.8*4.6
=12.88
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2.8*3.6+2.8
=2.8(3.6+1)
=2.8*4.6
=12.88

2.8*4.6 2.8*5-2.8*0.4