简便计算题12.5*64*0.2.69*0.4*5怎样简便运算
问题描述:
简便计算题12.5*64*0.
2.69*0.4*5怎样简便运算
答
12.5*64*0.025
=12.5*8*4*2*0.025
=(12.5*8)*(0.025*4)*2
=100*0.1*2
=20
答
12.5*64*0.025
=12.5*8*2*4*0.025
=(12.5*8)*2*(4*0.025)
=100*2*0.1
=20