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9x3﹣4x2, 9x4+4, 9x3+4x, 9x4﹣4
3x-5x=2x 3x2+x=4x3 -7a+4b=-11ab -3ab2-ab2= -4ab
)2x(3x-2)=5x2-4x ( )(2y +3x)(3x-2y)=9x2-4y2 ( )(x+2) 2=x2+2x+4 ( )(x+2)(2x-1)=2x2+5x-2
4x400m 3x400m+400mx1/4 3x400m+3/4x400m 4x400mx1/2
#define f(x) 4*x*x+3*x+2 #define f 4*x*x+3*x+2 #define f(a) (4*a*a+3*a+2) #define (4*a*a+3*a+2) f(a)
-2x+3 -6x2+4x -6x2+4x+3 -6x2-4x+3
(x+2)(x-6) (x-2)(x+6) (x+3)(x-4) (x-3)(x+4)
40x(1+25%)÷(1-12%)x10%x(3+2) 40x(1+25%)÷(1-12%)x10%x(4+3+2) 40x(1+25%)÷(1-12%)x10%x2 40x(1+25%)÷(1-12%)x10%x4
x6÷x3=x2B (x-1)2=x2-1 x4+x4=x8 (x-1)2=x2-2x+1
2x+x=x3 (3x)2=6x2 (x-2)2=x2-4 x3÷x=x2
2x2-4x2=-2 3x+x=3x2 3x·x=3x2 4x6÷2x2=2x3
(x3)4=x7 x3•x4=x12 (﹣3x)2=9x2 2x2+x2=3x4