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﹣x﹣6+x﹣1 x+6+x﹣1 x﹣6+x﹣1 ﹣x+6x+x﹣1
6.5x10-6-8x10-6 5x10-6-8x10-6 6.5x10-6-7.5x10-6 >8x10-6
1≤X.OR.X≤6 X>=1.AND.X<=6 X≤6.AND.1≤X X>=1.OR.X<=6
2x-6+3x=19 2x-6-3x=19 2x-6+x=19 2x-6-x=19
x2﹣5x+6=x(x﹣5)+6 x2﹣5x+6=(x﹣2)(x﹣3) (x﹣2)(x﹣3)=x2﹣5x+6 x2﹣5x+6=(x+2)(x+3)
={x∈R|-2={x∈R|x<2},则A.∪(∁RB.)=( ) A.{x|x<6} B.{x|-2{x|x>-2} {x|2≤x<6}
(x=y=6,x+y,x+1) (x=y=6,x+y,y+1) (x=6, x+1,y=6,x+ (y=6,y+1,x=y,x+1)
for(x=1;x<6;x+=1) for(x==1;x<6;x+=1) for(x=1;x=6;x+=1) for(x+=1;x<6;x=1)
x(5+x)=6 x(5﹣x)=6 x(10﹣x)=6 x(10﹣2x)=6
{x|x<-1或x>2} {x|x≤-1或x>2} {x|x<-1或x≥2} {x|x≤-1或x≥2}
∀x∈R,x2+5x≥6 ∀x∈R,x2+5x=6 ∃x0∈R,x02+5x0≥6 ∃x∈R,x02+5x0<6
x2-5x+6=x(x-5)+6 x2-5x+6=(x-2)(x-3) (x-2)(x-3)=x2-5x+6 x2-5x+6=(x+2)(x+3)
4x+1-5x-1=-6,-x=-6,故x=6 4x+4-5x-5=-6,-x=-15,故x=15
4x+4-5x-5=-6,-x=-7,故x=7 4x+4-5x-5=-6,-x=-5,故x=5
4x0.7x6x160x(300-10)+2x0.7x6x160x180 4x0.7x6x160x(300-10)+1.22x2x0.7x6x160x180 4x0.7x6x160x300+2x0.7x6x160x180 4x0.7x6x160x(300-2x6)+1.22x2x0.7x6x160x180
X6,X21 X5,X21 X6,X20 X6,X23