怎样用简便运算做 1.76*0.4*2.3

1.76*0.4*2.3 = 1.76*0.4*2.5 - 1.76*0.4*0.2
= 1.76 - 1.76*0.08
= 1.76 - 1.76*0.1 + 1.76*0.02

1.76*0.4*2.3 = 1.1*1.6*0.4*2.3可以用2.3-1.1 = 1.6-0.4 = 1.2原式 = (2.3^2 + 1.1^2 - 1.2^2)/2 * (1.6^2 + 0.4^2 - 1.2^2)/2也可以利用2.3+0.4 = 1.1+1.6 = 2.7原式 = (2.7^2 - 2.3^2 - 0.4^2)/2 * (2.7^2 - 1.1^...