(-X二次方)3次方-3X二次方(X四次方+2X-2)

显示全部楼层 · 2010-7-1 14:26:28

（四分之三a六次方X二次方+五分之六a三次方X四次方-0.9ax三次方）/五分之三ax2

千问 · 2010-7-1 14:26:28

1、原式=-x^6-3x^6-6x3+6x2=-4x^6-6x3+6x22、原式=(3/4)a^6x2/(3/5)ax2+(6/5)a3x^4/(3/5)ax2-0.9ax3/(3/5)ax2=(4/5)a^5+2a2x2-(3/2)x

千问 · 2010-7-1 14:26:28

x-y+1=0则y=x+1斜率是1垂直则斜率是负倒数所以所求直线斜率是-1过(2,1)y-1=-1*(x-2)x+y-3=0 5.9*6.25-5.9*4.25 =5.9*(6.25-4.25)=5.9*2=11.8