求3.6x42.3x3.75-12.5x0.423x28的简便运算

求3.6x42.3x3.75-12.5x0.423x28的简便运算 3.6x42.3x3.75-12.5x0.423x28五年级简算 3.6x42.3x3.75一12.5x0.423X28 用简算 X3-3X+1=0 求X3+1/X3 2x3/1+3x4/1+4x5/1.41x42/1的和 13.6x42.3x3.75—12.5x0.423x2816x14.97÷199675x4.67+17.9x2.519.98x37+199.8x2.3+9.99x801.01+1.04+1.07+···+3.980.1+0.3+0.5+···+19.7+19.96.03+6.06+6.09+···7.950.02+0.04+0.06+0.08+···+0.22+0.24+···+0.96+0.98 MATLAB 多元回归 t检验自变量是x1-x4,因变量y改了一点程序向用还是用不了,求大神看下.谁再能解释下程序的意思.z=[x1,x2,x3,x41,x42];y=A(:,1); % example[n,k]=size(z);X=[ones(n,1),z];%构建结构阵XB=X'*X; %求算信 x的平方-3x+1=0求x3次方+x3次方分之一的值 已知x+1/x=3,求x3+1/x3的值 已知:X+X/1=3,求X3+X3/1的值 2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和 (x3+1)/[x(x-1)^3]求积分 X3次方-3X 求极限(2x3-3x+4)/(8+5x2-3x3) 已知x2-3x+1=0,求x3+1/x3的值 已知x2-3x=1 =0,求x3+1/x3 ..已知X2-3X=1=0,求X3+1/X3的值 已知x2-3x+1=0,求下列式子的值 x3/x6+x3+1