1.(-2/3x-3/2y)² 2.x²-(x+2)(x-2)-(x+x/1)² 3.[(
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/08/19 10:09:53
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
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.[(](/uploads/image/z/18600929-17-9.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%28)
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
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
1.计算:x-y分之x+y + y-3分之2x 2.计算:x+3分之x²-x-2 除以 (2-x) + x+3
1.f(x)=1-x² 2.f(x)=-3x+1 3.f(x)=2/x 4.f(x)=(x-x²)/
(x-y)X(2x-2y)²X(3x-3y)²
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
(3)(4x-2y)-[5x-(8y-2x-y)]+x (4)-(2x²-3x-1)-2(x²-3x
1.(2x-y)(4x^2-y^2)(2x+y) 2.(1+x)(1-x)(1+x^2)(a+x^4) 3.方程(x+3
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
1.y=x²-2x-1 (0≤X≤3) ; 2.y=2x+1分之x;3.y=2x+1分之x(x≥0)
6x+(2x²-3x)-(x²-1)
(2x²-2x+3)(-x³+x-1)
合并同类项:-6x²y-x+5x²y-2x+x³y+3x