1.(-2/3x-3/2y)² 2.x²-(x+2)(x-2)-(x+x/1)² 3.[(x+y)²-(x-y)²]/(2xy)4.3x-12x³ 5.-2a³+12a²-18a 6.9a²(x-y)+4b²(y-x) 7.(x+y)²+2(x+y)+1
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![1.(-2/3x-3/2y)² 2.x²-(x+2)(x-2)-(x+x/1)² 3.[(x+y)²-(x-y)²]/(2xy)4.3x-12x³ 5.-2a³+12a²-18a 6.9a²(x-y)+4b²(y-x) 7.(x+y)²+2(x+y)+1](/uploads/image/z/1064321-17-1.jpg?t=1.%28-2%2F3x-3%2F2y%29%26%23178%3B+2.x%26%23178%3B-%28x%2B2%29%28x-2%29-%28x%2Bx%2F1%29%26%23178%3B+3.%5B%28x%2By%29%26%23178%3B-%28x-y%29%26%23178%3B%5D%2F%282xy%294.3x-12x%26%23179%3B+5.-2a%26%23179%3B%2B12a%26%23178%3B-18a+6.9a%26%23178%3B%28x-y%29%2B4b%26%23178%3B%28y-x%29+7.%28x%2By%29%26%23178%3B%2B2%28x%2By%29%2B1)
1.(-2/3x-3/2y)² 2.x²-(x+2)(x-2)-(x+x/1)² 3.[(x+y)²-(x-y)²]/(2xy)4.3x-12x³ 5.-2a³+12a²-18a 6.9a²(x-y)+4b²(y-x) 7.(x+y)²+2(x+y)+1
1.(-2/3x-3/2y)² 2.x²-(x+2)(x-2)-(x+x/1)² 3.[(x+y)²-(x-y)²]/(2xy)
4.3x-12x³ 5.-2a³+12a²-18a 6.9a²(x-y)+4b²(y-x) 7.(x+y)²+2(x+y)+1
1.(-2/3x-3/2y)² 2.x²-(x+2)(x-2)-(x+x/1)² 3.[(x+y)²-(x-y)²]/(2xy)4.3x-12x³ 5.-2a³+12a²-18a 6.9a²(x-y)+4b²(y-x) 7.(x+y)²+2(x+y)+1
1. (-2/3x-3/2y)²=(-2/3x)²+2(-2/3x)(-3/2y)+(-3/2y)²=4/9x²+2xy+9/4y²
2. x²-(x+2)(x-2)-(x+1/x)²=x²-(x²-4)-(x²+2+1/x²)=x²-x²+4-x²-2-1/x²=-x²+2-1/x²=-(x-1/x)²
3. [(x+y)²-(x-y)²]/(2xy)= [x²+2xy+y²-(x²-2xy+y²)]/(2xy)=[2xy+2xy]/(2xy)=2
4. 3x-12x³ =3x(1-4x²)=3x(1-2x)(1+2x)
5. -2a³+12a²-18a= -2a(a²-6a+9)=-2a(a-3)²
6. 9a²(x-y)+4b²(y-x) = 9a²(x-y)-4b²(x-y)=(9a²-4b²) (x-y)=(3a-2b)(3a+2b)(x-y)
7.(x+y)²+2(x+y)+1=(x+y+1)²