120÷24-1.5×1.2 8/9×{3/4-(9/10-3/8)} 315+540÷12×13 简便计算
问题描述:
120÷24-1.5×1.2 8/9×{3/4-(9/10-3/8)} 315+540÷12×13 简便计算
答
120÷24-1.5×1.2
=5-1.8
=3.2
8/9×{3/4-(9/10-3/8)}
=8/9X{(30/40-(36/40-15/40)}
=8/9X9/40
=1/5
315+540÷12×13
=315+45X13
=315+585
=900