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5x3+2x 6x3+1 6x3+2x 6x2+2x
3x(x2–4x+4) 3x (x–4)2 3x(x+2)(x–2) 3x (x–2)2
2(x2-9) 2(x-3)2 2(x+3)(x-3) 2(x+9)(x-9)
x(3x+y)(x-3y) 3x(x2-2xy+y2) x(3x-y)2 3x(x-y)2
x・x3=2x3; x3÷x=x2; (x3)2=x5; x3+x3=2x6 .
x(x2﹣9) x(x﹣3)2 x(x+3)2 x(x+3)(x﹣3)
减去多项式2x2+5x﹣3,某同学将减号抄成了加号,运算结果为﹣x2+3x﹣5,那么正确的运算结果是( ) A.﹣3x2﹣2x﹣4 ﹣x2+3x﹣7 ﹣5x2﹣7x+1 无法确定
3x2y﹣2x2y=x2y 5y﹣3y=2 ﹣3x+5x=﹣8x 3a+2b=5ab
3x-2x=1 2x+2x=4x2 x3•x-1=x2 (-a3)2=a5
x3•x3=x6 3x2+2x2=5x4 (x2)3=x5 (x+y)2=x2+y2
5x3+2x 6x3+1 6x3+2x 6x2+2x
2x(x+3)2 2x(x﹣3)2 2x(x2﹣9) 2x(x+3)(x﹣3)
x(3x+y)(x-3y) 3x(x2-2xy+y2) x(3x-y)2 3x(x-y)2
x2+3x+2=x(x+3)+2 4x2﹣9=(4x+3)(4x﹣3) x2﹣5x+6=(x﹣2)(x﹣3) a2﹣2a+1=(a+1)2
T=X1X2 T=X1X3 T=X1X2+X3 T=X1X2X3