简便运算;(12*21*45*10.2)/(15*0.7*51)=
问题描述：
简便运算;(12*21*45*10.2)/(15*0.7*51)=
答
(12*21*45*10.2)/(15*0.7*51)
=(3*4*3*7*5*9*10.2)/(3*5*7*0.1*3*17)
= (4*9*10.2)/(0.1*17)
=(4*9*17*6*0.1)/(0.1*17)
=4*9*6
=2*2*3*3*2*3
=2^3*3^3(2的立方乘3的立方)
=72*3
=216
答
(12*21*45*10.2)/(15*0.7*51)
=(3*4*3*7*5*9*10.2)/(3*5*7*0.1*3*17)
= (4*9*10.2)/(0.1*17)
=(4*9*17*6*0.1)/(0.1*17)
=4*9*6
=216