Question

4.5*3.6+1.5*14的简便计算？

Answer 1

=1.5*3*3.6+1.5*14
=1.5*（3*3.6+14）
=1.5*（10.8+14）
=1.5*24.8
=（1+0.5）*24.8
=1*24.8+0.5*24.8
=24.8+12.4
=37.8

Answer 2

4.5*3.6+1.5*14
=1.5*（3*3.6+14）
乘法分配律简便运算
=1.5*（10.8+14）
=1.5*24.8
=1.5*(20+4+0.8)
再次应用乘法分配律
=1.5*20+1.5*4+1.5*0.8
=30+6+1.2
=37.2

Answer 3

简便计算：
4.5*3.6+1.5*14
=1.5*(3*3.6)+1.5*14
=1.5*10.8+1.5*14
=1.5*(10.8+14)
=1.5*24.8
=(1+1/2)*24.8
=24.8+24.8/2
=24.8+12.4
=37.2