简便计算:如果简便计算这题:19.65+4.35*2.6

问题描述:

简便计算:如果简便计算这题:19.65+4.35*2.6

=19.65+4.35+4.35*1.6
=24+8.7*0.8
=24+(8.7-1.74)
=32.7-1.74
=30.96