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△x1+[(△x1-△x2)/(x2-x1)](x-x1) △x1-[(△x2-△x1)/(x2-x1)](x-x1) △x1+[(△x2-△x1)/(x2-x1)](x-x1) △x1+[(△x2-△x1)/(x2-x1)](x1-x)
(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)
x2﹣1 x2+2x﹣1 x2+x+1 4x2+4x+1
x6÷x3=x2 (x-1)2=x2-1 x4+x4=x8 (x-1)2=x2-2x+1
x6÷x3=x2 (x-1)2=x2-1 x4+x4=x8 (x-1)2=x2-2x+1
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
x2+x+1 x2+2x-1 x2-1 x2-6x+9
x6÷x3=x2B (x-1)2=x2-1 x4+x4=x8 (x-1)2=x2-2x+1
8xy-6x2=2(4xy-3x2) 3x-xy=x(6-y) 4x3+8x2+4x=4x(x2+2x+1) 16x2-4=4(4x2-1)