(4x^2y-5xy^2)-(3x^3y-4xy^2)5a-[a^3+(5a^2-2a)-2(a^2-3a)]15+3(1-a)-(1-a-a^2)+(1-a+a^2-a^3)(4a^2b-3ab)+(-5a^2b+2ab)(6m^2-4m-3)+(2m^2-4m+1)化简再求值:5x^2+4-3x^2-5x-2x^2-5+6x其中x=-3体校里男生人数x女生是y,教练人数和学生人数的
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 22:43:39
![(4x^2y-5xy^2)-(3x^3y-4xy^2)5a-[a^3+(5a^2-2a)-2(a^2-3a)]15+3(1-a)-(1-a-a^2)+(1-a+a^2-a^3)(4a^2b-3ab)+(-5a^2b+2ab)(6m^2-4m-3)+(2m^2-4m+1)化简再求值:5x^2+4-3x^2-5x-2x^2-5+6x其中x=-3体校里男生人数x女生是y,教练人数和学生人数的](/uploads/image/z/1049833-1-3.jpg?t=%284x%5E2y-5xy%5E2%29-%283x%5E3y-4xy%5E2%295a-%5Ba%5E3%2B%285a%5E2-2a%29-2%28a%5E2-3a%29%5D15%2B3%281-a%29-%281-a-a%5E2%29%2B%281-a%2Ba%5E2-a%5E3%29%284a%5E2b-3ab%29%2B%28-5a%5E2b%2B2ab%29%286m%5E2-4m-3%29%2B%282m%5E2-4m%2B1%29%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A5x%5E2%2B4-3x%5E2-5x-2x%5E2-5%2B6x%E5%85%B6%E4%B8%ADx%3D-3%E4%BD%93%E6%A0%A1%E9%87%8C%E7%94%B7%E7%94%9F%E4%BA%BA%E6%95%B0x%E5%A5%B3%E7%94%9F%E6%98%AFy%2C%E6%95%99%E7%BB%83%E4%BA%BA%E6%95%B0%E5%92%8C%E5%AD%A6%E7%94%9F%E4%BA%BA%E6%95%B0%E7%9A%84)
(4x^2y-5xy^2)-(3x^3y-4xy^2)5a-[a^3+(5a^2-2a)-2(a^2-3a)]15+3(1-a)-(1-a-a^2)+(1-a+a^2-a^3)(4a^2b-3ab)+(-5a^2b+2ab)(6m^2-4m-3)+(2m^2-4m+1)化简再求值:5x^2+4-3x^2-5x-2x^2-5+6x其中x=-3体校里男生人数x女生是y,教练人数和学生人数的
(4x^2y-5xy^2)-(3x^3y-4xy^2)
5a-[a^3+(5a^2-2a)-2(a^2-3a)]
15+3(1-a)-(1-a-a^2)+(1-a+a^2-a^3)
(4a^2b-3ab)+(-5a^2b+2ab)
(6m^2-4m-3)+(2m^2-4m+1)
化简再求值:5x^2+4-3x^2-5x-2x^2-5+6x
其中x=-3
体校里男生人数x女生是y,教练人数和学生人数的比是1比10,教练人数是多少?
长方形的长是2x,宽4cm,梯形的上底长是xcm,下底长是上底长的3倍,高是5cm,哪个图形面积大?大多少?
(4x^2y-5xy^2)-(3x^3y-4xy^2)5a-[a^3+(5a^2-2a)-2(a^2-3a)]15+3(1-a)-(1-a-a^2)+(1-a+a^2-a^3)(4a^2b-3ab)+(-5a^2b+2ab)(6m^2-4m-3)+(2m^2-4m+1)化简再求值:5x^2+4-3x^2-5x-2x^2-5+6x其中x=-3体校里男生人数x女生是y,教练人数和学生人数的
化简
1.原式=xy(4x-5y-3x²-4y)
=xy(4x-9y-3x²)
2.原式=5a-[a³+5a²-2a-2a²+6a)]
=5a-(a³+3a²+4a)
=-a³-3a²+a
=-a(a²+3a-1)
3.原式=15+3-1+1-3a+a-a+a²+a²-a³
=18-3a+2a²-a³
=-a³+2a²-3a+18
4.原式=8ab-3ab-5a²b+2ab
=7ab-5a²b
=-ab(5a-7)
5.原式=8m²-8m+2
化简求值
原式=5x²-3x²-2x²-5x+6x+4-5
=x-1
x=-3,原式=-4
应用题
1.设教练人数z
z/(x+y)=1/10 z=10(x+y)
2.长方形面积s=8x
梯形面积s=(x+3x)5/2=10x
梯形面积大.10x-8x=2x
大2x
希望采纳