简便计算 6.8*16.8+19.3*3.2
问题描述:
简便计算 6.8*16.8+19.3*3.2
答
6.8*16.8+19.3*3.2
=6.8*16.8+(16.8+2.5)*3.2
=6.8*16.8+16.8*3.2+2.5*3.2
=16.8*(6.8+3.2)+2.5*4*0.8
=16.8*10+10*0.8
=168+8
=176