计算:(-3/4x²y-3/5xy²)-a(a³-1) 计算:a²﹙a²
计算:(1)3a/4b乘16b/9a²,(2)12xy/5a÷8x²y,(3)(-3xy)÷2y
计算2x²-5xy+6y²加多项式A时,误算成减去A,错误结果为7y²+4xy+4x
(1)计算:(a-1)(a²+a+1)=_____,(2x-y)(4x²+2xy+y²)=
1、计算x²y³÷(xy)²的结果是() A、xy B、x C、y D、xy²
计算a-b/a+b*a四次方-a²b²/a²-ab (2)4x²-4xy+y
计算:(-a的5次方)÷(-a)的-5次方;6x²y²÷3xy的4次方.
计算:x-y分之x - x+y分之y + x²-y²分之2xy 计算:a-1分之2a+2 除以 (a
计算:a六次方÷(-2a²)÷(-3a³)100x四次方y六次方÷(-2xy`15x³y)
计算:3a(a²-2a+1)-2a²(a-3) (2x-3y)(x+y)
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
计算(1)根号12xy÷三分之二根号y(3)根号a+b分之a+b(4)根号4c²分之a²b
计算:(-5a^6)²+(-3a³)³.a³ 计算:(x-2)(x+7)-2(3