1.8*1.9-1=0.8+0.9+0.8*0.9请问这个过程是怎么得出来的?有什么相关的公式吗?

1.8*1.9-1=0.8+0.9+0.8*0.9请问这个过程是怎么得出来的?有什么相关的公式吗? matlab总是显示Vectors must be the same lengths,请大师帮忙,我记录了一组数据,想画数据图,但是总是运行不了,程序如下：>> x=0.4:0.5:0.6:0.7:0.8:0.9:1:1.1:1.2:1.3:1.4:1.5:1.6:1.7:1.8:1.9:2:2.1:2.2:2.3:2.4:2.5:2.6:2.7:2.8:2 含水10%的酒精密度0.8·0.9+1.0·0.1=0.82错在哪里?10/(9/0.8+1/1)=0.816不是0. 含水10%的酒精密度0.8·0.9+1.0·0.1=0.82错在哪里?10/(9/0.8+1/1)=0.816不是0. x-1.8=1/2x+0. 简便计算!0.1+0.2+0.3+0.4+0.+1.8+1.9 4页0.8*5= 1.3*7= 13.2*4= 2.8*5= 3.5*4= 1.08*7= 0.9*9= 0.63*3= 1.1*6= 7.2*8= 5.2*3= 4.17*4= 3.06*8= 7.5*2= 1.007*6= 1.25*8=0.25*4=0.02*5=2.4*5=16.5*8=16.1*8=5.5*2=2.59*8=5.15*2=0.5*6=1.9*9=3.54*6=8.3*7=5.22*5=2.25*8=3.025*4=1.8*5=2.3*7=1.6*7=0.25*3=1 1.9-1.9*0.9简便算法 5.4除（3.94+0.86）乘0. 求救.两组数据,拟合.已知x=0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.O,1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9,2.0};Y={5.8955,3.5639,2.5173,1.9799,1.8990,1.3938,1.1359,1.0096,1.0343,0.8435,O.6856,0.6100,0.5392,0.3946,0.3903,0.5474,0.3159,0.1370,0.2 4a=0.9×0. 釉料加工工艺:料:球:水=1:1.8:0. 0.1+0.1+0.3+0.4+.+0.8+0.9+1=?简算 (1.8+x)/3=0. 1.8/x=7.2/0. 1.9*0.8-3.6X=0.8 这个方程怎么解? 简算:0.1×0.2×0.4×+0.2×0.4×0.8+0.3×0.6×1.2分之0.1×0.3×0.9×+0.2×0.6×1.8+0.3×0.9×2.7= X=0.8^_0.1 Y=0.8^_0.2 Z=log3^0. 0.8:0.4=x:0.