(1)(½m^4n^2-1/3m³n²-¼m²n^4)÷(1/6mn)
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(1)(½m^4n^2-1/3m³n²-¼m²n^4)÷(1/6mn)²;下转(2)↓
(2)[(-3m²n)²+(-mn²)³]÷(-mn)²;(3)[(3x²y+2xy²)÷xy]²;(4)[(a+b)²-(a+b)(a-b)]÷(-b);(5)[(x+y)(2x+y)+(x+y)(x-y)]÷3x
(2)[(-3m²n)²+(-mn²)³]÷(-mn)²;(3)[(3x²y+2xy²)÷xy]²;(4)[(a+b)²-(a+b)(a-b)]÷(-b);(5)[(x+y)(2x+y)+(x+y)(x-y)]÷3x
(1)(½m^4n^2-1/3m³n²-¼m²n^4)÷(1/6mn)²
=(½m^4n^2-1/3m³n²-¼m²n^4)÷(1/36m²n²)
=(1/2乘36)m^(4-2)n^(2-2)-(1/3乘36)m^(3-2)n^(2-2)-(1/4乘36)m^(2-2)n^(4-2)
=18m²-12m-9n²
(2)
[(-3m²n)²+(-mn²)³]÷(-mn)²
=(9m^4n^2-m^3n^6)÷(m²n²)
=9m²-mn^4
(3)
[(3x²y+2xy²)÷xy]²
=(3x+2y)²
=9x²+12xy+4y²
(4)
[(a+b)²-(a+b)(a-b)]÷(-b)
=(a²+2ab+b²-a²+b²)÷(-b)
=(2b²+2ab)÷(-b)
=-2b-2a
(5)
[(x+y)(2x+y)+(x+y)(x-y)]÷3x
=(2x²+3xy+y²+x²-y²)÷3x
=(3x²+3xy)÷3x
=x+y
=(½m^4n^2-1/3m³n²-¼m²n^4)÷(1/36m²n²)
=(1/2乘36)m^(4-2)n^(2-2)-(1/3乘36)m^(3-2)n^(2-2)-(1/4乘36)m^(2-2)n^(4-2)
=18m²-12m-9n²
(2)
[(-3m²n)²+(-mn²)³]÷(-mn)²
=(9m^4n^2-m^3n^6)÷(m²n²)
=9m²-mn^4
(3)
[(3x²y+2xy²)÷xy]²
=(3x+2y)²
=9x²+12xy+4y²
(4)
[(a+b)²-(a+b)(a-b)]÷(-b)
=(a²+2ab+b²-a²+b²)÷(-b)
=(2b²+2ab)÷(-b)
=-2b-2a
(5)
[(x+y)(2x+y)+(x+y)(x-y)]÷3x
=(2x²+3xy+y²+x²-y²)÷3x
=(3x²+3xy)÷3x
=x+y
设m等于1/5n求 2n/(m+2n)+m/(2n-m)+4mn/(4n²-m²)
1+n-m÷m²-n² --- ---- m+2n m²+4mn+4n²
1+n-m/m+2n÷m²-n²/m²+4mn+4n²=
(m²-6mn+9n²)÷(m-3n)-(4m²-9n²)÷(2m-3n)化简,
(m²-6mn+9n²)÷(m-3n)-(4m²-9n²)-(2m-3n)怎么做
设m=1/5n 设m等于1/5n求 2n/(m+2n)+m/(2n-m)+4mn/(4n²-m²)
计算:(-1/2m²n-1/3mn+1)·(-1/4m³n).
mn(m-n)²-n(n-m)³=n(m-n)²( )
(m²-2mn+n²分之m-n 减 m²-n²分之mn+n²)n-1分
4(-2mn+2m+3n)-2(3m+5n-mn),其中m+n=3,mn=-1
若m-n=4,mn=-1,求代数式(9-2mn+2m+3n)-(m+4n+mn)的值
先化简,再求值2m-(n+1)+(m²-2mn+n²-1)/m-n-1 ,其中m=2,n=3