24乘(6分之5-4分之1+3分之2) 7.81减（3.81减1.65）加2.25 怎样简便
问题描述：
24乘(6分之5-4分之1+3分之2) 7.81减（3.81减1.65）加2.25 怎样简便
答
24×(5/6-1/4+2/3)
=24×5/6-24×1/4+24×2/3
=20-6+16
=30
7.81-（3.81-1.65）+2.25
=(7.81-3.81)+(1.65+2.25)
=4+3.9
=7.9
答
24乘(6分之5-4分之1+3分之2)
=24×5/6-24×1/4+24×2/3
=20-6+16
=30
7.81减（3.81减1.65）加2.25
=7.81-3.81+（1.65+2.25）
=5+3.9
=8.9