72.19+6.48+27.81-1.38-5.48-0.62=?(简便运算)
问题描述:
72.19+6.48+27.81-1.38-5.48-0.62=?(简便运算)
答
=(72.19+27.81)+(6.48-5.48)-(1.38+0.62)
=100+1-2
=99
答
72.19+6.48+27.81-1.38-5.48-0.62
=72.19+27.81+6.48-1.38-5.48-0.62
=100+5.1-(5.48+0.62)
=105.1-6.1
=99