69.71-18.63+21.27用简便计算怎么算？
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69.71-18.63+21.27
=69+0.71-（18+0.63）+21+0.27
=69+21-18+0.71-0.63+0.27
=90-18+0.71-0.63+0.27+0.27-0.27
=72+0.71+0.27+0.27-0.63-0.27
=72+0.71+0.54-0.9
=72+0.71+0.29+0.25-1+0.1
=72+1+0.25-1+0.1
=72+0.25+0.1+1-1
=72+0.35
=72.35
=69+0.71-（18+0.63）+21+0.27
=69+21-18+0.71-0.63+0.27
=90-18+0.71-0.63+0.27+0.27-0.27
=72+0.71+0.27+0.27-0.63-0.27
=72+0.71+0.54-0.9
=72+0.71+0.29+0.25-1+0.1
=72+1+0.25-1+0.1
=72+0.25+0.1+1-1
=72+0.35
=72.35
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