42.72/0.48+0.52+0.48简便计算

42.72/0.48+0.52+0.48
=4272/48+(0.52+0.48)
=(4800-528)/48+1
=4800/48-528/48+1
=100-(480+48)/48+1
=100-(10+1)+1
=100-10-1+1
=100-10
=90这个简便反而复杂化了简便在于不用草稿纸，直接口算