1.计算(x+3y)^2-(2x+y)(x-y)
来源:学生作业帮 编辑:搜狗做题网作业帮 分类:数学作业 时间:2024/07/01 15:35:36
1.计算(x+3y)^2-(2x+y)(x-y)
2.(x+2)(x-2)-4x(x-1)+(2x+1)^2【化简求值】,其中x=-二分之一
【求完整解题过程】
2.(x+2)(x-2)-4x(x-1)+(2x+1)^2【化简求值】,其中x=-二分之一
【求完整解题过程】
![1.计算(x+3y)^2-(2x+y)(x-y)](/uploads/image/z/1121362-34-2.jpg?t=1.%E8%AE%A1%E7%AE%97%28x%2B3y%29%5E2-%282x%2By%29%28x-y%29)
(x+3y)^2-(2x+y)(x-y)
=x²+6xy+9y²-(2x²-2xy+xy-y²)
=x²+6xy+9y²-2x²+xy+y²
=-x²+7xy+10y²
(x+2)(x-2)-4x(x-1)+(2x+1)^2
=x²-4-4x²+4x+4x²+4x+1
=x²+8x-3
当x=-½时
原式=(-1/2)²+8×(-1/2)-3
=¼-4-3
=-6.75
=x²+6xy+9y²-(2x²-2xy+xy-y²)
=x²+6xy+9y²-2x²+xy+y²
=-x²+7xy+10y²
(x+2)(x-2)-4x(x-1)+(2x+1)^2
=x²-4-4x²+4x+4x²+4x+1
=x²+8x-3
当x=-½时
原式=(-1/2)²+8×(-1/2)-3
=¼-4-3
=-6.75
计算:(-x-2y) * (3x-y)
计算(x+y)(x+y)^2(-x-y)^3
有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-
计算2x/x^2-y^2 3x/y^2-x^2 y/(x y)(y-x)快!
计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2
计算(2x-3y)(x+4y)-(3x+y)(x-2y)
[(2x+y)(x-3y)+y(x+3y)]÷(2x)计算,
(x-3y)(y+2x)-(4y-3x)(3x+4y)计算
计算:(y-x)^3(x-y)^m-(x-y)^m+2(y-x)
计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
计算:(x-y)^2*(y-x)^2*(x-y)^6
1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y)