2.56+(7.39+4.28-10) 3.999+0.999+2.999+9.9 用简便方法计算

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2.56+(7.39+4.28-10)3.999+0.999+2.999+9.9用简便方法计算2.56+(7.39+4.28-10)3.999+0.999+2.999+9.9用简便方法计算2.56+(

2.56+(7.39+4.28-10) 3.999+0.999+2.999+9.9 用简便方法计算
2.56+(7.39+4.28-10) 3.999+0.999+2.999+9.9 用简便方法计算

2.56+(7.39+4.28-10) 3.999+0.999+2.999+9.9 用简便方法计算
2.56+(7.39+4.28-10)
=2.6-0.04+7.4-0.01+4.3-0.02-10
=14.3-10-0.07
=4.3-0.07
=4.23
3.999+0.999+2.999+9.9
=4-0.001+1-0.001+3-0.001+10-0.1
=18-0.103
=17.897