256*0.99+2.56 简便运算 48.7*0.45+0.513*45简便运算
问题描述:
256*0.99+2.56 简便运算 48.7*0.45+0.513*45简便运算
答
256*0.99+2.56
=2.56*99+2.56
=2.56*(99+1)
=2.56*100
=256
48.7*0.45+0.513*45
=48.7*0.45+51.3*0.45
=0.56*(48.7+51.3)
=0.56*100
=56