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x4・x4 (x4)4 x16÷x2 x4 + x4
a(x+y)=ax+ay x2﹣4x+4=x(x﹣4)+4 10x2﹣5x=5x(2x﹣1) x2﹣16+3x=(x﹣4)(x+4)+3x
(x-2)(x+4) (x-4)(x+2) (x+2)(x+4) (x-4)(x-2)
2x-4-12x+3=9,-10x=9-4+3,故x=0.8 ; 2x-4-12x+3=9,-10x=9+4-3,故x=-1 ; 2x-4-12x-3=9,-10x=9+4+3,故x=-1.6; 2x-2-12x+1=9,-10x=9+2-1,故x=-1 ;
(x+1)(x﹣1)=x2﹣1 x2﹣4x+4=x(x﹣4)+4 (x+3)(x﹣4)=x2﹣x﹣12 x4﹣16=(x2+4)(x+2)(x﹣2)
3MIDX4-X8 4MIDX4-X8 4MIDX4X5X6Z1Z2 4MIDX1X2X3X4X5
a (x + y) =a x + a y x2-4x+4=x(x-4)+4 10x2-5x=5x(2x-1) x2-16+3x=(x-4)(x+4)+3x
9x3﹣4x2, 9x4+4, 9x3+4x, 9x4﹣4
={x|x2-3x-4>0}, ={x|2x>8},那么集合(∁U.A.)∩B.=( ) A. {x|3<x<4} B. {x|x>4} {x|3<x≤4} {x|3≤x≤4}
2x﹣4=3(x﹣4) 2x=3(x﹣4) 2x+4=3(x﹣4) 2x+4=3x
3MIDX4~X8 6MIDX4~X8 4MIDX4X5X6Z1Z2 4MCCX1X2X3X4X5
x4·x3 =x12 (x3)4 =x7 x4÷x3=x(x≠0) x4+x4=x8
x=﹣x+(﹣4) x=﹣x+4 x=﹣x﹣(﹣4) x﹣(﹣x)=4
a(x+y)=ax+ay; x2-4x+4=x(x-4)+4; 10x2-5x=5x(2x-1); x2-16+3x=(x+4)(x-4)+3x
a(x+y)=ax+ay x2-4x+4=x(x-4)+4 10x2-5x=5x(2x-1) x2-16+6x=(x+4)(x-4)+6x
(x+2)(x﹣2)=x2﹣4 x2﹣4=(x+2)(x﹣2) x2﹣4+3x=(x+2)(x﹣2)+3x x2+4x﹣2=x(x+4)﹣2
(4﹣x)(4+x) (x﹣4)(x+4) (8+x)(8﹣x) (4﹣x)2
x=-x+4 x=-x+(-4) x=-x-(-4) x-(-x)=4