12.5x64x0.025简算
问题描述：
12.5x64x0.025简算
答
12.5x64x0.025
=12.5*8*8*0.025
=20没看懂!!12.5x64x0.025=12.5*8*8*0.025 （12.5*8=100 要记住的速算，8*0.025=0.2 4*25=100要记住的速算）=20