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2×16x=43(150﹣x) 16x=43(150﹣x)
16x=2×43(150﹣x) 16x=43(75﹣x)
x2-8x-16 x2+8x+16 x2-4x-16 x2+4x+16
48-(16x+12x-4x2)=16 16x+2x(6-2x)=32 (8-x)(6-x)=16 (8-2x)(6-2x)=16
(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)
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
(x+4y)(x-4y) (x+2y)(x-2y) (x+8y)(x-8y) (x+16y)(x-16y)
(x﹣1)2=4 (x+1)2=4 (x﹣1)2=16 (x+1)2=16
x(x+4)2 x(x-4)2 x3-4x(2x-4) x2(x-8)+16x
汽车为6轮汽车,其中2轮为驱动轮 汽车为6轮汽车,其中4轮为驱动轮 汽车为4轮汽车,2轴驱 汽车为4轮汽车,其中2轮为驱
(x﹣1)2=4 (x+1)2=4 (x﹣1)2=16 (x+1)2=16
)y2=8-4x ( )y2=4x-8 ( )y2=16-4x ( )y2=4x-16
(4﹣x)(4+x) (x﹣4)(x+4) (8+x)(8﹣x) (4﹣x)2
x2-6x-9 x2-4x-16 x2+6x+9 x2+4x+16
-x2-y2 = -(x+y)(x-y) x2y+2xy+4y = y(x+2)2 -49x2+x2y2 = (xy+7x)(xy-7x) 16x2+4y2-16xy = 4(2x-y)2